Try to keep the free cell open unless using it allows you to quickly make a pair to re-clear it, helps you make substantial progress on the pyramid, or helps you clear a card out of the reserves to surface an important needed card which was just beneath the top card. Try to work both sides of the pyramid to where you do not have one long area and the rest of the pyramid worked off already, or that will limit your play options & opportunities. As you use the top card on a stack it resurfaces the card which was underneath it.
Rather than cards being dealt one at a time with 2 open piles, in this game the 24 cards in reserve are dealt 3 at a time across 3 stacks. You can pair multiple cards from the tableau together, or pair one of them with the card atop the waste piles or on the free cell. Like traditional Pyramid Solitaire you pair cards which add up to 13 to remove them from the tableau.