Help regarding Japanese grammar

Check out the The Ultimate Additional Japanese Resources List!

There are a lot of resources there categorised and a lot of comments from people discussing them. It ultimately depends what kind of resource you want. There are basically three categories; apps, videos, and textbooks. is probably the most popular website/app as it lets you learn grammar in an SRS system in much the same way WaniKani does. There’s also TaeKim’s Guide, which is a static web based textbook.

In terms of videos, the most popular series are probably Japanese Ammo and Cure Dolly. Really depends on how you get along with the person making the videos and the presentation style.

When it comes to textbooks, Genki is the most well recommended and widely used.