It's not like sudoku. Every column and every row must add up to the value on the end of their respective number. For example:
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Red numbers are the rows, green numbers are the columns. Every pip has it's horizontal value on the top, and vertical value on the left. On the top row, the values must add up to 9. With the these numbers, you can only do that with 2+3+4. That means that the second column has a 1 in it, and the only way it can add up to 4 is add 3 to it. Then for the 3rd row because we added the 2, that means to get a 7 we have to add 1 and 4. Etc, hopefully you get the picture.
Some numbers that are easy to do are 1 (just a 1), 2 (just a 2), 8 (1+3+4) and 9 (2+3+4), so if you see these you can automatically put them in and work from there.
Thanks for coming to my Fap talk.