Learning JavaScript for the frontend is an absolute must! Learn basics of modern js and then start learning c# or java for backend. These languages are great for starting out, have a big community of tools and people which will help you immensely and not to mention tons of job opportunities.
After that you can pick up some fe library like vue.js (personally i think it’s the best most intuitive. Saying that as a react dev).
Start building out as you learn tho. Don’t wait to complete learning. A simple note taking app with a good FE and a backend with features like auth and a sql db to store data will give you much more learning than tutorials.