Left CTRL holds priority.
The rest of it is just clicking on lands to manually tap or giving permission for each transition when you have priority by clicking the correct command on the right side of screen. Dragging cards onto the board plays them, you can manually tap lands, etc. It took me one game of playing way too slow to figure out (other than the CTRL thing) and then I was okay.
The two new things I didn't know were "Explore" and "The City's Blessing". Most of the other stuff is the same.
Explore means "Reveal the top card of your deck. If it's a land then draw it. If it's not a land, choose whether it stays on top of the deck or goes into the graveyard; then the creature who Explored gets +1/+1." So a card might say "Choose a creature to explore. You can play an extra land this turn." Either you draw a land, or the creature gets +1/+1 and you choose whether or not you want to filter the card into the grave. The creature only gets buffed if it's not a land, which is the "trade-off" for not drawing the card. Then you get the extra effect listed on the card, in this case you can play that extra land if you drew it or any extra land in your hand.
Edit: I am using a real card as an example. I just don't remember the exact name, text, or mana cost other than it's green. /edit
"The City's Blessing" is a Rivals of Ixalan? mechanic. It's something you get the first time you have 10+ permanents on the field. Once you have it you have it for the rest of the game. A bunch of cards, especially Azorius cards, do special things if you have the City's Blessing.
Thanks for that. I thought it was supposed to be that simple but it wasn't working right for some reason. Example..
I was attempting to play a creature enchantment err aura like pacifism onto an enemy creature. I tapped the lands manually for it, chose the creature, but couldn't figure out how to make it resolve.. It was frustrating..