To form a good and well-detailed TA, it needs references so indicators, guidelines and a bit knowledge on how to read charts are a must.  That's how TA's should be.

But sometimes, there are people who rely on their instincts and past performance, they called it self-TA. Nothing wrong at all if they believed in that.

There are lots of resources already you can check via lurking on the world wide web that can be served as a reference to you if you are really interested to learn those. Hit your favorite web search engine with a keyword "crypto trading analysis" or something along those lines then start browsing.