How to create a google site map

https://padlet.com/idivramisjgzdf/bookmarks-s0242f5e8kl8eu0aju7o/wish/e9YpQNnvjbElQxjM

How to create a google site map<br/>A short search on Google for advice on developing a site map firstly threw up many hyperlinks to software program that you would be able to buy or download at no cost to create a site map