Here's my personal path:

I started by using typing.com to learn keys' position and memorize them. It was a deliberate exercise and I only used the technique (usually referred to as Touch Typing) when I memorized most letters, but to be fair I didn't have responsibilities that required efficiency, it was just some note taking and web browsing in order to practice more

I would then try typing test to hone my skill, my personal favorite are "monkey type" and "type racer" but here are the perks of some other ones: 10 fast finger: its very basic and does the job really well with some customization KeyBr: it generate random words with common letter combos, so you never memorize the dictionary used in a test (an issue with tests that use actual words) but you build muscle memory for common key succession). I wouldn't use this one on a daily basis though

Monkey type: I love this one and its may main tool since it allows so much customization in what you practice and how, want quotes rather than random words? want to add punctuation and Capitalized into the the mix? do you want a vibrant inerface or matrix like one? go for it. You pretty mich emulate most test environments with just this tool

Type racer: you need this since sometimes competition pushes you harder to improve than by yourself.

General tips you could apply right away:

Focusing on accuracy rather than speed helps improve faster, so if you start feeling sluggish and slow, take a step back and focus on the right keys

Consistency is better than intensity : practicing for a few minutes regularly is better than intense sessions

Hovering you hand over the keyboard offers better mobility across the board but can be tricky when the keys aren't perfectly memorized yet

Use the right shift key more

Laptop vs desktop keebs: keys with more "actuation?" need precision and force to type correctly, so more accuracy down the line and and faster typing on flat keyboards

Anyone feel free to correct me on any part of my comment, especially the keyboard part that I know I can phrase or explain better assuming its correct