What are some tips for winning?

Even though roughly 79% of games are winnable, be patient and Replay games when you get stuck!
Move a partial stack of cards from one column to another to reveal a card you can play to the Foundation
You can "Undo" as many moves as you like - tap "Undo" in the lower left corner
You can move cards from the Foundation back to the Tableau (-15 point penalty)
Don't be so quick to move Waste cards straight to the Foundation! See if there's a place in the Tableau first. This can help you later in the game!