Vigilance is like the Serra Angel, it means that Attacking doesn't cause the creature to tap.
If you know what the tap symbol looks like, there is now an untap symbol. Pay the mana and untap your creature to have the effect happen.
Retrace - If the card with retrace is in your graveyard, pay the mana cost of the spell and discard a land from your hand and the spell can be played again.
Flashback - pay the flashback cost of the card in your graveyard, remove the card in your graveyard from the game, but the effect goes off again.
Chroma - This ability counts the number of mana symbols of a certain type in all permanents you control and has an effect based on them when the creature comes into play.
Evoke - Play the creature for the Evoke cost to get the "comes into play" effect, but sacrifice the creature afterwards.
These are a start, it would be better if you contact me with questions that I can answer directly instead of trying to guess what you may or may not know.
Welcome back to MTG, I hope you enjoy playing it as much as I do.