for familysearch.org. you join free of course, make your tree, then whenever you want to see your tree you just sign in.
Ancestry of course one has to pay for this one 6 months for a certain amount, sign in every time, but you create a tree on there.
another one is a free one called wikitree.com you join, sign in, create your trees, I like this one cause there is a lot of help here.
and there’s more places, some you pay some you don’t. and there are these places that sell you a program, mine is Family Tree Maker,
I got this through a group I am in, which was free to me. but if you wanted it, though the company itself, does cost money, not sure how much,
And there are a lot of these programs out there that do this, you will have to do some research on that. oh and BTW I think Ancestry is or has a free program for people to download, not sure of the name at the moment. maybe different in your country as
should I put a couple of links on here?