Question i dont know where to start with upgrading?

Oct 1, 2020
1
0
10
I bought my pc in 2018 and I need a new power supply because mine got fried. But I also want to buy cheap good stuff to help with performance.

Gamer Ultra GUA268 w/ AMD FX-6300 Processor 3.50 GHz
Nvidia GeForce GT 730 2GB
8GB Memory
1TB HD
disk space
ram and processor

those are the current specs of my PC
I definitely need more space and a better graphics card but I really don't know much about what to get.