Here is the way I have stored my common tabs for work. I also do this for writing and other businesses I help with.
Saving/bookmarking websites you use all day into a folder, and opening all of them at once, is such a time saver.
Here is how I do it:
Step #1 GIF
Bookmark all tabs you like to have into a folder.
Step #2 GIF
Right-click "Work" folder and open all tabs. Then pin them all.