I’ve realized I don’t actually believe it’s possible to “teach” someone a language.
You can provide resources, but the student needs to use them.
You can answer questions, but the student needs to ask them first.
You can point at a word and say “This means that.” And then the same again for the next word. And then again, and again, and again. But a dictionary can do this too.
You can give a long awkward explanation of all the grammatical exceptions to the rules, but you’ll probably leave them even more confused than when they started.
What you can do is inspire them, give them passion – the longest-lasting and most useful gift you can give someone who wants to learn a language. If you ignite the flame of excitement within them to pursue the language on their own, they will continue to learn for the rest of their lives, even without you.