How to remove junk and duplicate files

What you can do may depend on the macOS version your MacBook Pro is running, which you have not shared with us.

In latter macOS versions, there is an option in System Settings to optimize storage:

I see that, as well as the option to empty Trash automatically, safe to use.

Another safe option is to check your Time Machine snapshots:

View APFS snapshots in Disk Utility on Mac - Apple Support.

If your Time Machine drive has remained continually connected, there should only be two. If more, remove all but the latest two. That uses Apple software so I consider it safe.

A hardy +1 on etresoft's warning about aftermarket "clean-up" apps that have to use pop-ups to sell. Some have even removed critical system files, leaving a Mac doing a good imitation of a doorstop. At best, they rob you of perfomance. And your money.

"How to remove junk and duplicate files: looking for a quick simple way to just remove junk, duplicate files, things I don't use or need any more on my MacBook pro"

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Removing Junk:

"System Data" would be something to apply here. So, se if you can rid of lots of space by ridding of it. Use my User Tip: How to Use Finder to Clear “System Data" on a Mac - User Tip

It would be far better to start with a description of what problems you're experiencing.

So far, it just sounds like you've been listening to scam ads on the internet. Don't do that.