ron2456 :
I use it for light gaming and mostly word processing like making ppt presentations. I can't figure out which m.2 my board supports since there is one slot.
Direct from Asus:
https://www.asus.com/us/Motherboards/PRIME-B350M-A/specifications/
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AMD Ryzen™ Processors :
1 x M.2 Socket 3, with M key, type 2242/2260/2280/22110 storage devices support (SATA & PCIE 3.0 x 4 mode)*2
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Assuming you are using a Ryzen processor, that slot can take either a SATA based drive OR an NVMe based drive.
For your stated use, an NVMe drive probably isn't worth the extra $$$ per GB.
So, an M.2 SATA drive, and maybe another 2.5" SATA III SSD.
Or, a single large m.2 or 2.5" SSD. Price and performance would be almost exactly the same...m.2 or 2.5" drives.