Spoiler:So I choose french.
I studied english in school but all I remember from it is: when I should use "an" and where "a" before word, "the" article, irregular verbs "be-was were-been"....and that all. There are was definitely more than that. So for english I already have some base like "London is a capital of great brittan." from the school.
But is it possible to learn it using ONLY youtube videos and similar sources of information, without knowing anything else? Did my english will help me with this or not?