Do you remember the Mentor Project? It was the Koinup Pre-groups Era, Trixibelle called to action all Second Life art and photography experts, asking them to share techniques and help with beginners.
Now Mentors has came back with a a new brand name (and group), it is called Tips and Techniques and it has been founded, obviously, by Trixibelle (you may know her also as Cala Rossini)
As I was saying earlier with the mentor project, if you are a mentor you can join the group in order to share tips, tricks and techniques with friends. While if you are a beginner, you can join the group (now) to ask help to other people
Here's a tutorial by Raul Crimson on the use of lighting in Second Life
Enjoy the group now!