There are a lot of schools of thought on TA. Many people swear by it, many don't believe it applies to Cryptocurrency. Personally, I can see the value, but few proponents out there are adept in this art. But - the market charts track human emotion/psychology, so with a good source of info' you can find them useful to choose your positions.
There are a variety of tools that are used, please see the videos below, curated to save you time looking for the best sources of info' and trusted sources to use.
A nice and clear effort to understand the why, where and how of charts, RSI, Fibonnaci and an introduction to the technical analysis.
It is interesting that the Samurai are involved....
Have a look. Get a pen and pad to make notes.
Trend lines and getting involved, want to know which way things are going? Want to understand more about the candlesticks and wicks? Learn to spot the trend lines and make smarter decisions about where to invest your $.
Flags, pendents, and the likes...
Engulfing candlestick pattern. Watch the other videos first. This will require an understanding of other concepts first.
Fibonacci retracements and extensions analysis techniques.
Again, watch the other videos first.