Thank you IM Bacon. I'm sure I will learn in time with more reflection and reading but when does the Endgame generally start? How do I know when I am in it?
How else to approach games apart from targeting F2/F7?

As far as endgames go?
Keep it simple...start with the basic KP vs. K endings and work your way up from there.
If you dont know how to win or draw this...
Dont try and figure out more complicated endings yet.
In the endgame, your king becomes a fighting piece. You want your king to be active, supporting passed pawns, attacking the opponents pawns. A centralized king is a happy king.