- Don't be desperate and offer higher prices for things that you really want to buy so that you can sell. Don't be scared to just walk away and say "No Thanks".

- Don't be desperate in selling and offer lower prices as this will lose you alot of money.

- Buy Low as you can and sell as high as you can.

- Focus on one thing and not just everything in you bank. This will increase sales.

- Always keep a calculator window open on your computer when trading but if your computer is slow, get a calculator from your desk or something.

- Don't be scammed, always check the second window before accepting.

- Sell things in large groups eg. do not sell 75 rune ess at a time, people will not buy unless they say "Buying 75 ess".

- Never sell things that are crucial to your money making. If you use combat for money making, don't sell your Dragon Battle Axe. If you choose woodcutting, don't sell your axe.

- Don't over-price things, you don't want to be called a scammer in public.

 

This is all I can think of at the moment. I will post more.