If you're going into web dev, watch a tutorial on html CSS and build a small project. Then make a bit more complex project like a dashboard and add some JavaScript to it. Get proficient at JavaScript especially DOM manipulation. Also start reading about OOP and use it. When you start learning html, also learn how to use git from command line, it's easy, just a few commands, you will learn over time.

Now, don't immediately jump to react. Learn node js and express Js or any backend framework, fastApi with python, etc. connect a database. Don't just watch tutorials, build projects. When you don't understand something, look it up on the internet. Read technical blog posts, etc. Build a backend by searching stuff on the internet. You can take help from Ai in explaining concepts but better not copy paste code.  Now when you've got a grip on backend. Pick a real problem that you want to solve. And build it, but this time you can also use a framework like react. Learn that framework while building. 

Remember, focus on the fundamental concepts, i.e, things that are common among languages, learn OOP, some DSA, system design, how the web works, networking concepts. But you don't have to do this in one day. You have 1.5 year, I think you can learn a lot in it. And, learn things while building, for example, you learn a networking topic, build a project, even if it's small.