Blockchain is not a fundamental technology, it's more of a programming pattern derived from Bitcoin.

Learning cryptocurrencies one by one is a horrible waste of time, there's so many of them and 99.9% are garbage. Just learn how Bitcoin works, and then research a bit about alternative network design choices like PoS and masternodes, just to be informed.

Technical analysis is not an objectively the best way to trade, some even say it's akin to pseudoscience. Simply buying and hodling Bitcoin is one of the most effective strategies to make profit.