Knowing what to teach a new player is so important in games. They're not going to have fun if they're drowning in the deep end

I have a Talrand commander deck specifically designed to teach new players. It is real simple to explain: you get creatures by casting spells, use those creatures to attack people. All the spells are low mana cost "do a small thing draw a card". There is utility everywhere worded simply and it's great for new players. Then to keep them engaged with a chance to win I threw in a couple things like coat of arms that can fire off a same turn win even against better decks

I also collect ttrpgs and being able to teach relevant rules in an engaging way is required. I'd never be able to play half the games I own if people didn't like the learning process to try them out. With ttrpgs it's easier to be like "eh I don't like that we're glossing over that rule" than with board games though which can really smooth out the initial learning curve