Great idea Bullets. There are a lot of pretty basic things people need to know to keep their gear functioning.
I'm leaving this thread open so people can add their own advice and tips. Obviously if your advice is bad it'll be deleted

Please try not to turn the thread into a discussion. Would be nice if we can keep it uncluttered.
I'll get the ball rolling with;
- Silicone oil is your friend. WD40 and oil based lubricants are not. Seriously.
- 12g bbs (Mostly yellow) are a sure way of destroying your gear. Stick to at least .20g.
- Paintball bbs will also ruin the internals.
- Do not reuse bbs in an AEG!!!
- Do not dry fire.
- Do not leave springs compressed. With an AEG, fire a shot in semi automatic before you put it away. This will decompress the spring. Empty magazines when not in use.
- If you can, try to discharge batteries after use.
- Disconnect batterys from AEGs and store them separately when not in use.
- When you buy a clone, give the barrel a good cleaning. Most of them are filthy. Make sure to turn the hop up off fully! Not doing so can damage it.
- If your clone mags are misfeeding, try mags by a name brand like Marui or Classic army.
- High caps must be wound before shooting