If you're new to New daily Sudoku, begin with the easy puzzles. These provide a gentle introduction to the game's rules and logic. Pay attention to the patterns and relationships between numbers in rows, columns, and 3x3 subgrids. As you become more comfortable, gradually move on to harder puzzles.
One of the key techniques in Sudoku is using pencil marks. In each empty cell, jot down small numbers that could potentially fill the space. This helps you keep track of possibilities and eliminates candidates as you progress. Eventually, some numbers will become definite, making it easier to fill in the remaining cells.
When you spot two or three cells in a row, column, or subgrid that can only contain the same two or three numbers, you've found a naked pair or triplet. This means those numbers can't appear in any other cells within that row, column, or subgrid. Use this information to eliminate candidates and solve more cells.