What do these do?
Hello MellowFresh, did you ever tried using the ingame game guide?
I know you complained about bad tutorialization, but some of the things you are asking are answered in the game guide.
Prefixes and Suffixes are Affixes.
Items can have 2 up to 2 prefixes and up to 2 suffixes.
There are several ways to indentify what is an affix and what is a prefix.
Most notable in the name of the item, in the ground label indicator and in the tooltip.
Name of the item and ground label indicator are not turned on by defautl and need to be enabled.
The little arrows in the tooltip are always present.
Here, I marked prefixes as red and suffixes as blue:
Also here is a excerpt from the game guide of the relevant article:
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