The Best Way to Learn a Language, According to Research

Research points to a mix, not a single method. Here’s the best way to learn a language, according to the evidence:

1. Learn the 2,000 to 3,000 most common words on purpose.
2. Spend most of your time listening to and reading material you mostly understand.
3. Review new words with spaced, active recall.
4. Speak regularly with someone who corrects you.
5. Put in the hours, consistently.

Input (step 2) is the engine. The rest makes it run faster. Most learners get the balance wrong by doing too little of it.

How to start learning a language on your own

Start with one beginner course or textbook made for self-study. Look for dialogues with audio, translations, short grammar notes, and exercises with answers. Then stay with it until the end. Switching between courses feels like progress, but you mostly end up repeating the same first chapters.

From the first week, add comprehensible input: videos or audio you can mostly follow, thanks to slow, clear speech, pictures and context. A course explains how the language works. Comprehensible input is how you learn to understand it.

What the research agrees on

1. Make understanding the core of your day

In the early 1980s, linguist Stephen Krashen argued that people acquire a language one way: by understanding messages in it. Later research pushed back on “one way”. A large review of instruction studies by Norris and Ortega (2000) found that focused teaching helps too, and output research showed that speaking does as well. But the core of Krashen’s idea is widely accepted: you get better at a language mainly by understanding a lot of it.

2. Learn the most common words on purpose

Words aren’t equally useful. A few hundred (the, and, is, que, de) make up a huge share of everything anyone says.

Reelang counted every word in 35,615 native video clips in 23 languages. Across 18 of those languages, the 1,000 most common words covered about 80.7% of a typical clip, the top 2,000 covered 86.7%, and the top 5,000 covered 92.4%.

The first thousand words get you four known words in five. That’s why it pays to learn them deliberately, with a frequency-ordered deck or a course, instead of hoping to pick them up. After the first 2,000 or 3,000, input does more of the work, because new words show up surrounded by ones you know.

3. Keep everything at the edge of what you understand

How much do you need to know before input works? Research gives two numbers.

At 95% known words (one unknown word in 20), van Zeeland and Schmitt (2013) found second-language listeners understood well. At 98% (one in 50), Hu and Nation (2000) found readers could manage fiction on their own.

At a normal speaking pace of 150 words a minute, 95% still means about seven unknown words every minute. That’s enough to learn from without getting lost. How many words does that take in real videos? In Reelang’s data, the typical English clip reaches 95% at about 4,500 words, and the typical Spanish clip at about 6,800. You don’t have to wait until then, though. With 3,000 words, about one Spanish clip in ten is already at 95%, and with 5,000, about one in three. The skill is finding those clips. Speed matters as well: see how fast native speakers talk.

There’s a catch in practice. Level labels don’t always predict vocabulary difficulty. In Reelang’s data, the share of words covered by the top 2,000 barely changed from A1 (beginner) clips (84.0%) to C1 (advanced) clips (84.1%). What changed the numbers was the topic: recipe and food clips were far harder than their labels suggested. So check the topic as well as the level.

Try it with this short Spanish clip, where someone reports a very strange theft. Count the words you don’t know: if it’s fewer than one in 20, the clip is at your level.

YouTubeFrom 0:01 to 0:18

Smart subtitlesword by word in English

Merobaronunavaca.

0:01 / 1:36

Spanish from SpainStrong beginner

Learn with this on Reelang

4. Review with spacing, from memory

Spreading reviews out works better than cramming them together. This is the spacing effect, and a review of 317 experiments by Cepeda and colleagues (2006) found something useful on top: the longer you want to remember something, the wider the gaps between reviews should be. For words you want to keep for months, gaps that grow (day 1, day 3, day 7, day 21) work better than seven reviews in a row.

Recall matters as much as timing. In Karpicke and Roediger’s (2008) study, students learned 40 Swahili words. Those who kept testing themselves recalled about 80% a week later. Those who stopped testing words once they’d got them right once recalled only 30 to 40%. Trying to remember an answer builds memory more than reading it again. Flashcards with spaced repetition do both, which is why they work so well for the first few thousand words.

Spaced repetition software (SRS) schedules these reviews for you. Anki is the best-known program.

5. Speak, and get corrected

Merrill Swain studied Canadian students taught entirely in French. They understood French very well, but years in, they were still making the same grammar mistakes when they spoke (Swain, 1985). Her conclusion: when you try to say something, you notice what you don’t know (Swain, 1995). Michael Long’s interaction research (1996) adds that conversation, where the other person signals they didn’t understand, pushes you to fix it.

So speaking matters, and listening alone won’t get you all the way there. In practice, though, speaking goes better once your listening is ahead of it, because you’re reaching for patterns you’ve already heard many times.

6. Balance your time

Paul Nation’s “four strands” (2007) is one of the most practical summaries of the research, and he later showed how to apply it when you’re learning on your own. A good program gives roughly equal time to:

• Meaning-focused input: listening and reading for meaning.
• Meaning-focused output: speaking and writing to communicate.
• Language-focused learning: vocabulary, grammar, pronunciation on purpose.
• Fluency development: easy material, done fast, to build speed.

Most app-based learners spend almost all their time in the third strand. Moving even half of that time into listening is usually the biggest single improvement they can make.

7. How long does it take to learn a language?

Every method takes time. The US Foreign Service Institute estimates that English speakers need about 600 class hours of full-time study for Spanish or Italian, and about 2,200 hours for Arabic, Chinese, Japanese or Korean, to reach professional working proficiency. Those are classroom hours with daily homework on top, so treat them as a rough guide rather than a finish line.

You can’t skip the hours. You can make each one count more, by spending it on material you understand.

What to do after your first course

Move to material made for native speakers. It’s harder than a textbook, but you get to choose what you like. Start with something you already do: if you follow football, cooking or music, follow it in your new language.

Expect progress to feel slower from here. In Reelang’s data, the first 1,000 words cover about 80.7% of a typical clip. The next 1,000 add 6 points, and the 3,000 after that add fewer than 6. This is the intermediate plateau: you’re still improving, but each new word comes up less often. More listening is how you meet those words enough times to keep them.

The hard part is finding videos you can follow, because a random video is often too fast or too difficult. Reelang is a free feed of real native videos at your level, in more than 40 languages. It doesn’t replace your first course. It’s for what comes next.

What the research doesn’t support

• Learning styles. You may prefer visual or audio material, but tailoring how you study to that preference doesn’t make you learn better. A 2008 review by Pashler and colleagues found no good evidence for it.
• “Fluent in a few months.” Real proficiency takes hundreds of hours. Fast claims usually mean basic conversation, not understanding native speakers.
• Grammar first, everything else later. Grammar study helps, but learners who only study rules don’t learn to understand speech.

A weekly plan built on the research

Adjust the minutes to your week. Keep the shape.

For language-specific roadmaps, see the best way to learn Spanish and the best way to learn German.

FAQ

How can I learn a language fast?

Learn the most common 2,000 to 3,000 words quickly with spaced flashcards, then switch most of your time to listening and reading you can mostly understand. Add speaking practice once a week or more.

Is immersion the best way to learn a language?

Immersion works when you understand most of what you hear. Without a base, much of it is noise, so it pays to learn the most common words before you go and to keep listening to material at your level once you’re there.

Can you learn a language just by listening?

You can learn to understand a language mainly by listening. Speaking well also needs speaking practice, and a little focused study speeds things up.

Can you learn a language by watching videos?

Yes, once you know the basics. Videos give you the volume of real listening that courses can’t, as long as the clips are at your level so you understand most of what you hear.

How do I practice listening in a new language?

Watch short native clips at your level every day. Start with slow, clear speech, watch each clip twice (with then without subtitles), and move to natural speed when you stop pausing.

How many hours a day should I study a language?

Consistency matters more than length. 30 to 60 minutes a day, most of it listening, beats long weekend sessions.