So I'm fairly new to chess, and I've never played OTB. The only chess etiquette I have picked up comes from watching Svidler/Van Wely stream. It seems they think it is disrespectful to decline draws in drawn positions and then try to flag. So I don't do that.
But apart from that I'm clueless. I've seen people say that not accepting rematches can be rude. Is that true? Any other advice is appreciated.