Minesweeper is mostly counting: every number tells you how many mines touch it. Comparing two neighbouring numbers reveals most mines, and a few common patterns cover the rest.
Basic counting
If a number has exactly as many closed neighbours as its value, all of them are mines. If it already has that many flags, all other neighbours are safe. These two rules solve most of an easy field.
The 1-2-1 pattern
Along a straight edge of opened squares, the numbers 1-2-1 mean there are mines under both 1s and not under the 2. This pattern appears often and is always safe to apply.
The 1-2-2-1 pattern
Along a straight edge, 1-2-2-1 means the mines are under the two 2s, while the squares under the 1s are safe.
Chording saves time
Instead of opening squares one by one, flag the known mines and tap the number. All remaining neighbours open at once. It is faster, but a wrong flag will make it open a mine.
Guess wisely
When no logical move remains, pick the square with the lowest chance of a mine. Corners and squares far from numbers are often safer, and opening them may reveal new information.
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