[cgag]

I do think going through a basic textbook is important but imo they shouldn't be a part of your plan once you get through one or two. I learned all the rules of spanish grammar more or less in a few semesters in college, but it's just a stepping stone to help with getting tons of input. Like now that I've listened to hundreds of hours of spanish, i just get the subjunctive. Occasionally youtube will recommend me a youtube video explaining it and hearing the rules people throw around seem pretty useless. You hear them and think about them and go, huh, i guess that is true, but for learning I don't think it helps beyond having in the back of your mind as you consume the language, I wouldn't spend any time doing grammar drills or anything with them.

Something else people should keep in mind (i don't mean for this to apply to you, i just don't want to make a separate post) is that people will give you language learning advice and claim to speak a language when they can't watch tv, listen to podcasts, or read books in it. If you aspire to this kind of level (no judgement if you don't) do not listen to anyone who hasn't reached it.