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Learn the skill
In S3U Draw-One Klondike, foundations count up in one suit: ace, 2, 3, through king. Columns count down by one rank and alternate red and black. Hearts and diamonds are red; clubs and spades are black.
Worked example
A black 6 of clubs can go onto a red 7 of hearts in a column. A red 5 of diamonds can follow the black 6. But a red 6 of diamonds cannot go onto the red 7: the ranks fit, but the colors do not alternate.
Check Rank and Suit
The hearts foundation already has ace and 2 of hearts. Only 3 of hearts comes next there. A 3 of diamonds is the right rank but the wrong suit. In a column, a visible run such as 6 of clubs followed by 5 of diamonds can travel together onto a red 7. Only a king, alone or leading a valid run, can fill an empty column.