[Solved] Making stickers from scratch

[Orion Pobursky]

And this is what I understand. But why there is Brickowl 1167942? Where this number is from?

The different inventory sites assign different numbers. Rebrickable generally uses the first number on the sticker sheet, we use the second, and Brickowl/Bricklink make up their own number. The reason for the keywords is to easily find stickers when searching for them. This is also the reason a set keyword is required.