I learned fluent Japanese by IGNORING the details

Spending a lot of time trying to memorize words and grammar points is usually a waste of time for beginners. That information isn't actually useful unless you're able to process and retain it. To make a metaphor, you're better off filling a cup with a faucet, rather than a fire hydrant: having tons of water is only helpful if your container can contain that water. We suggest that beginners focus on quantity, simply getting a rough idea of what something means and then moving on, trusting that you'll flesh out your understanding of the finer nuances to these words and grammar points by immersing in native material and seeing how native speakers actually use them. Consuming a lot of content in Japanese (or any other language) will enable you to build a mental database of how words are used in context. This exposure will provide the foundation you need to eventually get value from revisiting detailed grammar explanations or comparing similar grammar points.