I don’t remember when exactly, but I learned basic grammar through Tae Kim a while into my studies (lv10ish, WK-wise, perhaps). I used an anki deck that someone had put together from all the sample sentences to drill it after reading it. After this I felt that grammar wasn’t often what was holding me back.
I’d also look up words as I read, so I’d learn a few grammar points that are basically just words (はず, べき, etc) that way.
I’ve been starting to encounter N3+ grammar more often recently, and have been struggling to find a way to learn it that fits me, but just a few weeks ago I ran into this post recommending 日本語の森, and I’ve been kind of bingeing on their N3 and N2 grammar videos (taught in Japanese) since.
The plan, for now, is to watch videos and then make my own anki cards from the sample sentences along with the japanese explanations. I’ll see how it goes, but it seems promising so far.