Lessons are the easiest way to progress in a given skill. You can learn as many lessons as you have lesson credits for. You can type LESSONS to see how many lesson credits you have accumulated.
Lesson credits are gained in various ways: by mere time in Avalon and every day if you are subscribed, or by completion of experiences, quests, reaching new levels, or by using crowns to purchase them for immediate use.
This lesson credit can be used any time you like to LEARN from another player, NPC or CCC and thereby increase whichever skill you choose to learn. Lesson credits stack so you do not need to use them immediately.
Check out HELP SKILLS for command and syntax details for LEARN, TEACH, SKILLS and other important commands for learning and browsing skills and their abilities lists.
Use the LEARNING command to check if your current location and/or character state is such that the gain of lessons is restricted, e..g. if you are at the Pool of Life or in an enforced protected location. Most invulnerable locations are non-lesson gain. Idling and certain non-human forms like poltergeist or ghost prevent lesson gain too.
Lesson and lesson-potential info is shown when you type LESSONS or, among other pertinent character attributes, using the STATUS command.
Syntax: HELP PROCURE.
It is possible to acquire lessons via procurement to speed the pace of learning and ability acquisition. Procurement is explained in HELP PROCURE. It uses Avalon crowns, which are gained from experiences and using "real world" currency purchase and subscription tiers or through exchanges with gold coins.
Syntax: HELP GAIN.
If you have procured lessons and want to know how to use them either for learning or for accelerated lesson gain, check out HELP GAIN for all the info.