What can i do by learning RUST?

With rust you can do anything you want.

For applications you can use egui/iced 

For misc stuff, the standard library already has everything you need for simple stuff.

For websites, you can use so many crates it ain't even funny anymore, the most popular ones are rocket and yew tho afaik.

Rust is a really flexible language and you can do anything because of already existing crates, if what you want to do is so incredibly niche there's not a crate for it, you can just make your own.

Rust is pretty much a do all language, you can run code very close to the hardware making any application written in rust very fast, you can do pretty much everything. But just because you can do everything, it doesnt mean you should, for example web development.

many things (dry asl reply) but ill move it to the side for now

you can bypass fe

you can make a nuke

you can kill everyone

moral of the story:
rust is great for backend but its prefered you just use the traditional js frameworks or just html css js for your frontend
rust is also great for making high performance desktop web apps because of Tauri but the usage of rust in that will not be that high
you can make cool external hax with rust (i havent tried internal ones)
you can also make discord bots with rust using serenity

making games with rust currently isnt a very good idea as the game engines for rust are still not done growing and are like baby engines so its best to just not do rust for games rn

you can also make pretty fast operating systems with rust but im sure you're not going to do that

With Rust, you can do everything C and C++ can. C can do everything C++ and Rust can do. C++ can do everything C and Rust can do.

Although I personally don't like C++ or Rust, you should try it.

Personally I like C more because of it's simplicity while being able to do everything that C++ and Rust can do (speaking of what it can do during runtime).