Always make sure that wherever you are while at your workplace, you need to clean up after yourself. Whether it's at your desk or at the kitchen, try not to make a mess and be as clean as possible. When you leave, ensure that there isn't too much clutter at your desk so that the cleaning staff can do their work appropriately.

Yes, even if you don't like someone, try to be as cordial as possible. Smile more often and exchange pleasantries. You're not in kindergarten; you're a grown-up individual now, so behave that way with everyone regardless of what you think about them.

Again, this is something that you need to keep in mind always. You can't just barge in on people and start talking about something that needs to be done. If you're going to take somebody's time at least have the courtesy to ask them if they have a few minutes. And if they're busy, come back later.

Nobody is going to call you for a surprise meeting, so if you have something planned beforehand make sure that all the arrangements are planned beforehand too. Book a meeting room for a particular slot and then be courteous enough to vacate the room when your time is up.

Yes, you might think that you're going to eat the rest of that butter chicken but if somehow you end up not eating it, please throw it away before it becomes too stale and starts to smell. The fridge is for everyone to use, so make sure that you don't end up creating a mess in it.