What is the best way to crop an image for a website?

Question

css

In general, there is a header background 1300 pixels wide, the background size is 146 kb, I think it's better to cut out a small part of the background and not the whole background, so the picture itself will weigh less

Answer 1

Not a very clear question. Drop the link where you found this background, I'll cut it out for you and show you how I did it ...

Answer 2

cicada principle