Answered once already but I'll do it 99+ times if it exposes more people to understanding themselves.
How to Read by Mortimer J. Adler. Thought it'd be prudent to read it before trying to read though science journals. My mother was drinking dandelion tea blindly because she's body-concious and The View fed her detox woo-hoo magic.
That was likely the first instance I was aware, of my own volition, that I didn't know despite having had known 'how to read'. An introduction to the Dunning Kruger effect before I was aware of it.
The following 4 years was a spiritual speed-run that likely wouldn't have happened if I didn't read this one book. Not even the skills, but the connection to powerful ideas like philosophy, sociology, theological discussion, morals and purpose... And I'm still not done the back!
Special mention to video game Noita. Trying to resolve the lore and all the outside reading I undertook to do so unironically helped my awakening as it's deeply tied into the journey we all must endure.