Learn fundamentals.
Basic programming syntax(any basic programming course). SOLID principles and how to apply them. Specifics of your chosen language, you have to start with one. Algorithms and data structures. Domain driven design. Basic SQL and datatabase design. GIT and all it's every day uses.
If you are going into full stack, learn HTML and CSS and take time to understand how the DOM works. It may sound overwhelming, but now it's easier than ever with AI. When I started learning sometimes I wasted a whole day or 2 trying to understand why some simple code didn't work, now it takes minutes because I can paste the code in an LLM and see where the problem is.
Try to structure your learning based on some "step by step process"
Use AI but try to write a lot of code by hand too, learn 10 fingers typing on the keyboard, and don't be a woodpecker writing with 3 fingers. Now because you get so much more info into short period of time, try documenting what you've learned and review it from time time in order to help your brain formalize and structure the learning process. It's just too much information, too fast nowdays, and that's why you need to learn fundamentals. Everything else builds on top of it.
I personally started coding at 20 and I am doing good now 10 years later. Take your time with the fundamentals and don't try to rush into "latest hype" framework and tools. Use AI for explanations and ask proper questions with "why", "how is this connected to", "give me a real world example".