I usually tie them in and then weave the ends in as I go along if that makes sense.
As others have said, I just keep going until the blanket is the size I want and then finish off with a double crochet border to give a firmer edge.
I find joining squares fiddly but do so on a small item like a baby blanket as the squares can then be of various designs which looks really attractive.
Good Morning Thursday 7th December 2023
Indulgences ... do you have one?