Confusion about entry points and node trees

Never mind…i figure it out….but my question still is..
when am i supposed to add a new logic tree? can i have multiple entry points in one logic tree?
Im sorry if those questions have been answered before…if they did i couldnt find them.

If i plan to use logic nodes multiple times what is the workflow regarding logic trees?? weird enough, almost all tutorials only have a demonstration of one operation only….
thank you!!!!!

You can use many entry points. We call such branches as threads. For sharing information between threads use global flag in Variable Store node.