Hey & welcome to GT! First, a little overview explanation, then I'll address your questions.
[br]There are 3 primary categories of tutorials on GT.
1. Core Learning System. This is an integrated step by step curriculum of lessons that start at absolute beginner. The idea here is to isolate & streamline the cirriculum all in one step-by-step process.
https://www.guitartricks.com/beginner.php
2. Song Catalog. This is all the songs GT has the secured the rights to teach.
https://www.guitartricks.com/songs.php
3. Instructor Directories. These are more specialized topics, sometimes organized in sub-categories. You can view the instructors & their specialty here.
https://www.guitartricks.com/instructors.php
For example, I have over a thousand lesson on various topics, organized by topic or focus. In general, these are for diving deeper into any given concept or technique. They are not necessary per se to the streamlined core learning system, but will help once a student develops more interest in a certain style or technique.
https://www.guitartricks.com/instructor.php?input=155014
Lisa also has tons of other lesson.
https://www.guitartricks.com/instructor.php?input=311296
We encourage all beginners to work through the Fundamentals courses, then the style course of their choice. If your knowledge & skill level is beyond the Fundamentals material, then skip to the styles!
At any level you should look for songs you enjoy, want to play & are close to your skill level.
Most importantly, if you have a question about a certain topic, or how to do some skill, please ask! The GT database of lessons is enormous! That's one reason the forum is here, to help you find the resources you desire.