Queens is solved by elimination. Instead of hunting for queens, mark every cell that cannot hold one. The queens then appear in the few cells that are left.
Begin with the smallest regions
A region of one, two or three cells leaves very few choices. If all of a region's cells lie in one row, that row's queen belongs to that region — so every other cell in the row can be crossed out.
Cross out around every queen
As soon as you place a queen, mark its whole row, its whole column, the rest of its region and the eight cells around it. This one habit solves most easy boards.
Row and column locks
If two regions sit entirely within the same two rows, those two rows must hold the queens of those two regions. All other cells in those rows can be crossed out. The same works with three regions in three rows, and with columns.
Test a cell by its effect
Imagine a queen on a cell and look at the cells it would block. If that would leave some region with no free cell, the queen cannot go there — mark it with ×.
Use the hint sparingly
The hint button places one correct queen or removes a wrong one. It is a good way out when you are stuck, and the number of hints appears in your shared result.
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