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When to edit .less file and when to edit .css file

lz7cjc asked
Last Modified: 2015-03-22
I have bought a template which has both a .css file and a .less file. I have been playing around with these since i want to change some colours and sometimes I have to change the .css and other times the .less. i have looked up documentation on this and it doesn't make a lot of sense. It says that it is a pre-processor - does this mean it then creates the .css?

Are there any rules I can follow as to whether I should be updating the .css or the .less? I am using trial and error at the moment which is taking forever so if I understood how they worked I would be much happier!

thanks for your help
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