Emily Short’s Rules Flowchart is old, but these fundamentals haven’t changed. Reductive description of the whole game: follow the Startup rulebook, then follow the Turn Sequence rulebook over and over until you stop, then follow the Shutdown rules.
@OtisTDog lists the Turn Sequence with more annotation here.
Tthere are (at least potentially) things changing at every step; trying to address “difference between right at the end of one turn, and the start of the next” would require knowing exactly what points we’re talking about… (unless you mean the difference between having just finished the final Turn Sequence rule for one turn and having not yet begun the Turn Sequence for the subsequent turn, then it’s easy again: there’s no difference).