Hey all, looking for some advice on patching up these 2 small holes in our garage next to the door. We just moved up to New England, its about to get cold, and we want to get everything set up before the season comes. I've also posted this into r/homeimprovement and just looking for some help as I am a real novice with these things

I've looked a few other resources that mentioned basic foam insulation, simply covering it with a piece of wood, and just looking for some more advice before I actually take any action.

https://imgur.com/a/IejdDVD

I am not a very good photographer, but then, these are not very exciting pictures.

Both of them are about 4" long by .5" wide, certainly not anything too extreme, but as a first time homeowner I just want to make sure I'm doing the right thing. Any advice on what to do, or more importantly what Not to do would be greatly appreciated. Thank you!