There is no shortage of advice on how to learn a language, and most of it is not wrong so much as incomplete. Each method below does one job well and other jobs badly. The useful question is not which one wins, but which two or three you can actually keep up for a year.
1. Comprehensible input
Read and listen to material you can follow with a bit of effort — not the news on day one, but a graded reader, a children's show, a podcast made for learners. The idea is that you acquire grammar and vocabulary by meeting them in context often enough, rather than by memorising rules first.
What it is good at: natural word order, collocations, the rhythm of the language. What it is bad at: speed. You need a lot of hours before input alone fills out your vocabulary, and it is easy to plateau at the level where you understand the gist and stop noticing the words you are missing.
2. Spaced repetition
Instead of reviewing everything equally often, you review each item just as you are about to forget it. Get a word right and the next review is pushed further out; get it wrong and it comes back sooner. Flashcard apps built on this principle are the backbone of most serious vocabulary plans.
What it is good at: making vocabulary stick, cheaply, in measurable quantities. What it is bad at: being pleasant. It requires you to sit down and do a queue of reviews, daily, and the queue is unforgiving about days you skip. Most people quit here.
3. Speaking before you feel ready
Conversation with a tutor, an exchange partner, or anyone patient turns passive knowledge into words you can actually produce. It also exposes the gap between what you recognise and what you can say, which is usually much wider than learners expect.
What it is good at: fluency, confidence, and finding out fast what you do not know. What it is bad at: coverage. An hour of conversation recycles the words you already have far more than it introduces new ones.
4. Immersion in things you would watch anyway
Switching your shows, music and phone interface to the target language costs no extra time in your day. Subtitles in the target language rather than your own keep it honest.
What it is good at: volume of exposure, and keeping the language present in your life. What it is bad at: precision. Without something that records what you met and brings it back, most of what washes over you does not stay.
5. Passive exposure through the device you already check
The newest of the five, and the one with the lowest cost per day: put the words where you are already looking. Most people glance at a phone or a watch dozens of times a day, for a second or two each time. Those seconds are otherwise spent on the time and the weather.
What it is good at: consistency. There is no session to start, so there is no session to skip, and the exposure keeps accumulating on the days when studying was never going to happen. What it is bad at: depth. Glances build recognition, not grammar and not conversation — this is a method to run alongside the other four, not instead of them.
Watch Your Language is built entirely around the fifth one. It puts the words you are learning in a widget on your iPhone Lock Screen and on your Apple Watch face, and schedules which words show up using the same spacing idea as method two — so the pair that usually costs you a daily review session costs you nothing but the glances you were already making.
So which ones should you pick?
If you are starting from zero, input plus something that handles vocabulary is the pair that gets you moving. If you have been studying a while and stalled, it is almost always speaking that is missing. And if the problem is that you keep stopping altogether — the most common failure by far — then the honest fix is not a better method, it is a method with a lower daily cost, which is the whole argument for passive exposure.
