The subjunctive in French

These videos by French Spanish online explain it really well!

When I read, I can understand that they've used the subjunctive (le subjonctif) but when I write.. it becomes a headache remembering when to use it!

In my previous post about the song, "Si tu veux qu'on s'apprenne" is using the subjunctive.
If you want that we learn (teach) ourselves.