[nikdaheratik]

It depends on what you want to do. If you want to get a pro job then it takes a lot more time investment then a hobby.

I started out in the same tech stack and have been doing this since late 2000s. TBH, a modern web framework with a js frontend is overkill for a hobby project. If you want to mess around with just the front end, start with a hackable static site generator like http://spress.yosymfony.com/ Hack the templates and you can get a good starting place for how much has changed on the front end.

Learning WordPress templating is another good hobby kind of place to start. Actually, if you get really good with that, you can probably turn it into a job on its own (though less money than more full stack type work).

If you were wanting a career change, you need to learn just enough of one backend framework and just enough from a frontend framework to land an entry job. Then learn everything you can from reading someone else's code. There is no project that you can do on your own that would teach you the entire stack as quickly and you'd get paid to learn it.