All TA is based upon PA - computerised indicators just give an objective reading within a certain arithmatical framework. Support/resistance and pattern analysis is powerfull - but has the drawback of being more subjective.
My MACD will allways give me the same reading - however I’m feeling - and as long as I have a well defined system - theoretically Ill allways trade it the same way - making backtesting a powerfull tool.
How I decide to draw my support line on the other hand, has allot to do with how I’m feeling today
My 2 cents, for what its worth (and I’m no master), would be to complete the babypips school, and then to go for an introductory book on TA that covers both aspects.