Cover

[Mafilux]

I have an upcoming encounter with a Chimera in a burned village, so there's going to be a good amount of cover around for the players to utilize. Just wondering how cover works, I was going to do it via disadvantages on the rolls of the Chimera against a unit in cover, is this the proper method? Thanks.

[Zejety]

Half cover: +2 bonus to AC and Dex saving throws against effect originating from the other side of the cover.
3/4 cover: As above but with +5 bonus instead of +2.
Full cover: Can't be targeted directly by attacks or spells.

Source: DM screen (slightly paraphrased)