Well it's difficult for me to tell you exactly how to learn finance from scratch because admittedly I have had a professional interest in finance, not just personal. But there are sort of 'holy grails' when it comes to books on investing. I'd recommend "The Intelligent Investor" by Benjamin Graham as it is the defacto bible for investing.

Unfortunately, a lot of what I know is from learning about equities, fixed income, real estate, derivatives and other traditional financial investments. There was also a short lived period of time that I was obsessed with Forex, which is when I learned the majority of what I know about TA (and where I learned to scrap most of it too).

The truth is, you don't need to know much to be successful. I'd study more about how to control emotions in investing and set a foundation so that you win no matter the outcome (even if it goes down). I have enough invested in other assets that it doesn't matter to me what happens with Bitcoin. I also have made enough with Bitcoin that I'll never exit the market with less than I put in. While it is a fallacy to think that you are only playing with 'profits' (as there is no difference between a 'profit' dollar and a normal dollar), it does prevent you from making stupid decisions that make it so you don't come out ahead.

Probably the easiest way to learn is to put in the Goldilocks amount of money into the market that you are 100% willing to lose, but it will suck / bother you if you do. That amount is different depending on your income and net worth, but find that amount and put it into market based on your thoughts and see how your emotions play with you. Best of luck!