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I'm pretty new to 40k. This will be the first question of many.

What are the rules for rerolls that make you worse off? Even though the rule and fluff are there to be better.

I'll use "and they shall know no fear" as an example. It's there to be a fail safe or damage limitation. But there is the possibility the reroll worse and lose more from a unit.

Which result do you take? Or is it up to the player to risk the worse possibility?

The modifier rule is another problem entirely.

I did do a search but didn't get any viable answers.

You take the newest result, even if it's worse.

Yes, the re-roll has to be used, even if worse. So it's always up to the player to risk it.

Not sure what you mean with modifiers. How you use them is in the Battle Primer/Rulebook.

You always use the rerolled result even if it's worse. That's the risk you take.

As to whether you have to check the ability some are listed you may these are option some are not listed with the may theae are mandatory

The vast majority of re-rolls are optional, the only ones off the top of my head that are mandatory are Index SoB Seraphim and Deathwatch Xenophase blades, along with the Death Guard Arch-Contaminator warlord trait and the Plague Skull of Glothila (which I had to look up to double check ).

Iirc Corruption (Nurgle relic) requires all failed to wound to be rerolled

Thanks Amigos