For the sake of argument, I have some knowledge of bitcoin and blockchain but that I didn’t use them due of my unstable financial situation. I'm about to begin investing and even trading.
Blockchain is a digital public ledger distributed among the participants called nodes, so each and every node can verify the data present in the ledger and validate the data which gives the trustless mode of validation.
Bitcoin is different so don't confuse it with blockchain.
You don't need to have a technical understanding of blockchain to invest in Bitcoin, just the fundamental analysis is enough in my opinion.