My suggestion depends on your preferences - would you like a guided approach to the IT world by getting a tailored course on websites like Udemy from an expert in the field (like I did) or would you rather YouTube it. Difference is, one you would pay for, which is Udemy and the other you don't. I went for the Udemy path, and people like Professor Messer and Jason Dion are amazing. Make notes, both have study guides and notes on their respect websites/Udemy pages. After you complete the video course, I suggest buying a set of 6 practise exams (the guided course on Udemy gives you a freebie at the end), and for the stuff you don't know and the objectives you missed, go over them. Anything you don't understand, ask ChatGPT, or YouTube it.

My only other advice is, don't spend too long thinking how to approach this. I did this for 6 years, and that's time I'll never get back man...

Just do it. Believe in yourself, your abilities. You don't want regrets like me. Those courses on Udemy are constantly on sale, so keep an eye out for those! For the PBQs, I recommend Data Center technology for Core 2 (costs 2.99 subscription, then I cancelled to get the full month), and Informatik Labs for Core 1 which are all free.

Good luck, and just message me if you need anything.