The knowledge and tools needed to learn to trade are in the public domain. But a person needs more than mere knowledge.
Skills and experience are also necessary. A person gets those by doing; specifically, doing successfully.
This is where most people trip and fail and risk damaging their minds permanently by repeated failure. Examples of people with permanently damaged minds can be observed on this site.
In reference to the topic of this thread, trading for a living through day trading, it is a rehash of the eternal small dream of the modern working stiff seeking an escape.
Anyone who has been trading for a while knows he doesn’t need to trade for a living. The markets exist to transfer money into your accounts set up to collect across various market fractals.
Day trading futures is a lifestyle choice. Day trading for a living is for people who are barely making it.
I went into scalping after I was doing well first in long term stocks for 14 years, then long term commodities for 2 years. Took ten years before I was at confident in scalping.
I have developed "Holy Grails" and one is scalping and another in day trading, four are options. By end of year I will only be trading long term commodities and options.
I use to recommend intraday trading, but not any more, takes way too much time to get very good to make better than average living. Plus, if you older than 55yo, between body and memory losses, gets tougher.
Long term commodities and learning to hedge has made most for me, getting risk near zero and not having to to check every tick. Same with options, wait for limit entries/exits.
Day trading/scalping, life goes by and you are sitting staring at a screen. Really lose our own life.

