Starting from the forum main page that lists all the forums.
I like to check NEW POSTS first. That takes you to all the new posts.
You can do NEW TOPICS or the other links on the site and forum if you wish.
If you go to a NEW POST you can either click the POST TITLE if you want to read it from the beginning or you can click the double arrow icon to view the last post in the thread.
After you read a post at the bottom of the thread or make a post at the bottom of a thread you have these links to choose from to leave the thread. I usually go back to NEW POST but if I want to stay in the forum I'm in just GO TO TOP then get back to the forum you are in. Or click FORUMS which is more direct.
If you're on your phone and at the last post of a thread click the dropdown GO TO and it opens the same links as the last pic above.
Navigation is easy once you get used to it.
Right now the forum has been slow during high traffic times but that will be fixed starting tomorrow.
You may find a better way to navigate for YOU but the above is what I do.
Open to questions and comments.