How do I best setup secure RDP for a Windows 10 machine?

Hey folks,

I have a Windows 10 machine that I want to be able to RDP into sometimes. I realized a lot of it was already setup/configured for Windows 10 using Windows' RDP. I tested I could connect to it on my internal network. I overall want to connect to it via RDP from the public. I tested port forwarding from my router to it and that did indeed work. I still feel cautious about leaving it up. I have antivirus, but I don't feel like that would prevent a brute force attack.

What are ways I can have secure Windows' RDP sessions to my computer from an outside network?