HITORI
Remove duplicate numbers from each row and column by turning the cell black. You cannot have any two black cells next to each other. The remaining white cells must create a single continuous area, undivided by black cells. Use the circle symbol to mark known white cells.

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Pick an example here

1 - unique numbers  
2 - look for triples  
3 - corner 4s  
4 - pair and single  
5 - known removes unknown  
6 - contiguous white  

Step-by-step will take you through the main strategies. It may not complete the harder Hitoris since these require a broader overview of the remaining clues.