Not really helpful advice for learning it, but I think just getting familiar is a good start.

I like the way https://sakubi.neocities.org/ emphasizes it:

Basically, this guide is a primer. This guide takes a very specific stance: The only way to acquire language features and become fluent is to consume them in a real context. This guide doesn't try to drill you, and that's a good thing.

When you read this guide, don't try to memorize it. It won't work.

You shouldn't spend a week on each lesson. In fact, I think one new lesson a day is far too slow, even if you're also reviewing old lessons.

Every single main lesson in this guide covers basic grammar. You should read the entire thing as quickly as possible. It's important to get stuff in your head sooner rather than later. It gives it time to grow, subconsciously, and even if you didn't feel like you learned it the first time, it makes it easier to remember it for good next time. Just don't get stuck reviewing it forever.

After you get far enough in this guide, you should start trying to read.

That is specific to that guide, but the idea being just not to worry about perfectly memorizing. Reading will be enough to better understand the points.

But if you're trying to push it to the next level, grabbing a textbook's workbook would probably be a good idea.