My main resource is currently BunPro, but I’ve noticed that related information (like the different conjugations of verbs) are scattered up along the lessons and make it thus very hard for me to remember. This is why I yesterday wrote a grammar guide to verb conjugation on my study log, to put the whole concept of verb conjugations in one system, to find out rules behind them that apply to Ichidan verbs as well as Godan verbs, and I think I was pretty successful.
This is something I want to do with other grammar points as well, like adjectives, because writing that guide helped me a looooooooooot, I’m now able to remember all that stuff way better!