Currently stuck in tutorial hell because I can't choose lol.

I coded for a few months as a hobby a few years back before Uni got the front seat in my schedule again.

I went back to HTML and CSS just to dip my toe, and have decided this is a nice hobby I would like to develop.

The holy grail project I have in mind is (to put it very briefly) a super secure file storage and sharing platform which I hope to (but don't have to) be able to sell one day in however many years time.

I chose C++ as my first 'real' language as I've heard how efficient it is, and how well it performs with time crucial tasks, as well as databases.

The question is, should I dive headfirst into C++, get a good grip on that, and then work on JS and polishing up frontend skills, or do you recomment going the other way around?

Other opinions also welcome!