The one circled is a gold crowned kinglet. Pretty little birds and full of energy. They’re fun to watch feed on bugs that fly. Little suckers are quick. You’re far enough north that they may hang around thru summer, but they really like the northern forests when its warm.
Those Red Breasted Nuthatches are northern birds too. They winter here where I am at and we have them all winter long at out feeders, but the first hint of the snow leaving and those birds are gone with it. We see them at the cabin all summer and into the fall. Red Breasted Nuthatches seem to be friendlier or easier to get close to than the common Nuthatches.
I have a bunch of bird ID books with actual photo color plates to work from and then there’s this site here that can be a big help as well as just plain interesting to look thru. Check it out.
http://www.allaboutbirds.org/