I am trying to write an os but I just don't get macros. don't think im a complete noob because I have experience in other language. I m great at java and python. I just need c/c++ for my os dev needs can someone give me examples of some easy/good macros and **comment them on what they are for**

Seriously though, why not focus on developing a useful app instead of an OS.
If you know Java well, you could pick up C# fairly fast and there's a way to build an OS using C# with a toolkit called Cosmos. I think that would be much easier for you.

See Cosmos:
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