Click on a photo, then press space to view. You can use arrow keys to navigate. You could also use the photos app by importing your folder. Just drag and drop.
Click on a photo, then press space to view. You can use arrow keys to navigate. You could also use the photos app by importing your folder. Just drag and drop.
Highlight all the photos you want to view at once, hit spacebar for quick look and then use the button with four squares to turn it into a contact sheet.
Just use preview to open the folder and browse them that way. When I first moved over from Windows I found the loss of that feature quite annoying, but preview is excellent.