1. Think ahead
Always think a few steps ahead before you make a move, especially in open games such as FreeCell.
2. Don't make a move just because you can
Never move a card just because you can. It always has to be part of a tactic, e.g. to reveal more cards. If there is no reason to move a card, don’t do it yet and a much better option might become available.
3. Increase your options
When you encounter a situation in which you can make two moves, choose the move that will increase your options for further play. One example is when there are two cards of similar rank available to play, pick the one that will result in uncovering the most cards or gets you closer to clearing a column.
4. Watch out for Kings and Aces
Most solitaire games don't allow players to move a King on top of another card, so always keep this in mind. Similarly, for Aces it is almost never allowed to put a card on top of an Ace, so once you have an Ace as the top card in a pile, you cannot use that pile anymore.
5. Use the undo button
Most games feature an undo button, so don't hesitate to use it to your benefit.