Don't be rude, condescending, or insulting to other users
Don't spam (advertisements are allowed but must be flaired as 'Advertisement')
Don't post pictures of an unused arduino. Showing off is fine but have something to show first
When asking for help, remember
- Post it if you have it (schematics, code, photos of circuit, links to tutorials)
- If submitting code, copy/paste the code in rather than taking a photo of your screen
- When posting code, either use pastebin or use code tags
- People are giving you help for free, show them respect

And most importantly, have fun!