Could someone explain senior job titles and pathways??

Hi, thanks for reading,

I was looking at the https://www.visualeffects.ninja/home vfx salary guide, when looking at job roles I saw a couple of roles that I have heard of but I can find much information on them or how people end up in those positions. As follows: Head/senior of dept, Visual effects supervisor - [(on set), (in house), (studio/ overall)], VFX producer, creative director.

if anyone knows in more detail the difference between some of these and what their job includes as well as the pathway into them, do most artist try to go for them or just stay a senior artist? are some disciplines more likely to go into these positions then others?? If you can help me out then that's much appreciated