Looks like you should maybe hit the Lessons a little harder. Really well designed course and some of the lessons directly address your problem but all will help increase your board vision and pattern recognition.
https://www.chess.com/lessons/key-openings/offbeat-openings
And this module will introduce you to d4 openings...
https://www.chess.com/lessons/intro-to-book-openings
Here's something a bit more advanced; it's from the mastery section, but might be worth going through to give you some ideas of what to look for in the opening phase...
https://www.chess.com/lessons/exploiting-typical-opening-errors
Hi, I've been focusing on my tactics book and doing a lot of puzzles lately and it's helped me a lot not to make obvious blunders. Right now I feel the thing that's making me lose games is spending too much time thinking where to move during the opening phase. I've never studied openings (people usually recommend focusing more on tactics first) so when confronted with something other than standard king openings I'm a bit lost. I think about where to move following the opening principles and don't make any opening mistakes but it's just too time consuming. Any recommendations on what to do?