There are many different ways to find solutions for a Sudoku puzzle. Here are a few of them.

Find a Row, Column, or Block with eight cells filled in and only one empty cell. Figure out what number is not represented in that Row, Column, or Block.

Find an empty cell with only one possible number based on eliminated values already present in Row, Column and Block that empty cell exists in.

Determine where in a Block a given number must belong based on eliminating Rows or Columns within the Block by looking where that number is in nearby Blocks.