Under My Feeds there are My Groups, Topics I Follow, and Bookmarks. How is the Topics section populated? Do I choose what shows up there? If so how do I choose the subjects I want in this category?
Just quickly, in passing ...
In relation to "My Feeds" Section ...
▬ My Groups
The "My Groups" sub-section is a LIST of the 'Group(s)' that you have "Joined" in the "Groups" Section.
▬ Topics I Follow
The "Topics I Follow" sub-section a LIST from, BOTH,:
(1) the "Help Centre Categories" that you have chosen to "Follow" in the "Q and A" Section
(2) the 'Topic(s)' that you have chosen to 'Follow" in the "Ideas" (ie. 'Feedback') Section.
The "Bookmarks" sub-section is a LIST of 'Posts', from wherever, that you have "Bookmarked"
I hope this helps.