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First you should think about what you actually want to build, then determine which features would benefit that type of application, from there you can consider the available tooling that facilitates the development of those features.

The fact that you are overwhelmed by the "start from scratch" approach makes me think you are falling into the common front-end pitfall of reaching for popular tools that you don't necessarily need (yet). These tools should be the answer to specific problems, instead of being problems that need an answer for why you should be using them.

If you find that you can't extract useful information from tutorials that don't match your exact stack, then its probably the case that you're taking on too much and don't really understand the context for why these tools were developed in the first place. You should learn to walk before you delve into the technical intricacies of augmenting your gait with a fusion powered exoskeleton.