I’m sorry if I asked this before, I suffer from a very particular kind of memory loss. I come bearing two questions and an unnatural amount of energy.
Question A: I was taught that は and が both mark the subject of the sentence, but how do I know exactly when to do so? Like how you use 私は__です yet おかしが大好きです。I have which one to use memorized for certain sentences, but I know there must be a better way of going about it.
Question B: My grammar is my weak point for sure. While I’m not starting from zero, I would prefer to start from the beginning anyways in case my lost memories are holding things or I forgot naturally some. But due to the pandemic and other life situations I have no money, so what are some free online resources that would work to guide me through many grammar points so I can level up my Japanese?



