The best way to learn it, is to set yourself a goal/problem, define as best as possible how many unique issues that problem can be broken into, then start solving them one-by-one, periodically stopping to evaluate how they fit together.

Learning the best languages and structures to use will come as result of this.

This is a very broad question, the answer to which will almost definitely be “yes, but”, so knowing what you are trying to achieve would be helpful.

Given how terrible the amazon search functionality is, I don’t see how this would work. There is an overwhelming number of products available there, so it is easy to find what you’re after eventually, but in my experience, the only way to actually find a specific product is with an external search engine.

My normal search pattern goes something like: pricespy/digikey/RS/mouser > if not available, or too expensive> aliexpress > if too much to sift through > google shopping > (this is where amazon links live)