I think the Player Guide (linked at the top of this page) would be very helpful for you to peruse.
Each new Wizard will choose their Primary School of focus when they create their character. You can learn all the spells in that school for free, either training at your Professor, or through quests.
You can learn spells from other schools too, but you must spend Training Points to do so.
You will receive one Training Point every 4 levels till 20. This means you will receive them at level 4, 8, 12, 16 and 20. After level 20, you will receive one training point every 5 levels. You can also receive training points through certain quests. In order to learn higher level spells of a school, you have to first learn the lower level spells.
If you make a mistake, visit Mr Lincoln in Golem Court. He will let you buy your Training Points back with Crowns, and you will lose those spells. You must be at least level 12 to buy back your Training Points. This transaction costs Crowns.
If this were possible, people would end up with a deck full of all the level 48 spells, which wouldn't be much fun for anyone. That's the fun of requiring training points... You have to be selective.
only spell you can buy and sell are those called on the Treasure Cards. once you use the spell it is gone. unless you Fizzle. then it goes back into your deck
