Use it to separate closely related independent clauses.
you use semicolon's, to separate a list form items, or connect two separate clause that are related to each other.
Usually to fix a run-on. Like: He spent all that day roaming the house; he found a hiding spot from all of that roaming, too.
No. A full stop is used to show the end of a sentence. A semi colon can be used to separate clauses or items in a list.
Because of the vicissitude of the weather this time of year, it is difficult to plan a picnic too far ahead.