Which USB to serial adapter should I buy?

[linuxuser]

@bmork

Any USB TTL adapter with 3.3V IO should work fine.

Probably should! Not a good start for me as a beginner.

@diizzy

Avoid the CH3** like the plague

@mk24

So get the CP2102

I do not understand why they sell 2, 3 or more pieces. Are they garbage and you have to test yourself which one works?