Help with understanding what to get

With Christmas coming around I was thinking of getting myself a bit of a PC upgrade. ATM I have a prebuild PC that I want to upgrade some of the parts for, in particular it needs more ram. However I have never done anything with upgrading my PC and have no idea what I would do. I currently have 2 things for ram that say XPC Gammix Dio and that gives me 16 MB, but Im hoping to get 32 if possible. How would I find out what I need?

This is what I have for info about my PC
Device name DESKTOP-8E5F0KQ

Processor AMD Ryzen 7 5700G with Radeon Graphics 3.80 GHz

Installed RAM 16.0 GB (15.9 GB usable)

Device ID 68382BAD-62BF-4409-A480-EB89A1671BDB

Product ID 00342-21927-65693-AAOEM

System type 64-bit operating system, x64-based processor