just highlight the offending photos and press DELETE, the photos won't be removed from the disc - no worries.
If you wantto select them individually - highlight the 1st photo, press the CONTROL (CTRL) key and then scroll and click each photo to be removed in turn. Then press DELETE.
If you want to remove a range, highlight the 1st photo, press the SHIFT key and then scroll to end end of the selection and click the last photo to be removed. The range will be selected (highlighted) Then press DELETE
The project will patch things up for you automatically - BUT its worth checking the fade between the cut sections - click the bottom of the join and quick menu pops up, choose - most people use cross fade of fade thru black.