I need help choosing memory Rams

To start, I'm the wrong person to be answering you because I'm crazy (see below).
That motherboard + CPU combo (R5-5600, NOT 5500/5600G) will support ECC memory, so if I were you (but you're not me), I'd use ECC memory (unbuffered only!), like these:

https://www.kingston.com/en/memory/server-premier/ddr4-3200mts-ecc-unbuffered-dimm

They have horrendously long latency (according to gamers anyway) because they're basically standard JEDEC modules, so CL22.

Any two sticks will run at 3200MT/s. Four 1R sticks will run at 2933MT/s, and four 2R sticks will run at 2667MT/s. I recommend two 2R sticks for best performance. I actually have an AsRock B550 PG-ITX setup with the same CPU (R5-5600) and two sticks of KSM32ED8/16HD running at stock speeds (3200MT/s).

But again, I'm the wrong person to answer your question because almost nobody uses ECC memory.

I'm shocked I might be able to convince one more person in the world to consider ECC memory! Here are some more tips.

https://www.crucial.com/catalog/memory/micron-did-agnostic
(Filter for "ECC UDIMM" and "VLP ECC UDIMM"). VLP=VeryLowProfile.
Remember, only UDIMM (Unbuffered DIMMs) will work.

I've had good luck finding these for reasonable prices at big-business retailers like CDW. I've also had good luck with ShopBLT for other things, but I never ordered memory from them. There are likely other options out there.

I know there are Samsung EUDIMMs out there, and specialty companies like Nemix, but I've stuck to Micron & Kingston for years now, because you'll know exactly what you're getting (i.e. who manufactured the DRAM chips).