Here are 4 tips for today's trading. This will help you decide where you should invest and what to look for:
1. Stock market mover
Rolls-Royce: Shares in aerospace engineering company Rolls-Royce Holdings (RYCEY) fell by as much as 22% in London trading before recovering slightly after the company warned about a "challenging" business outlook in 2016.
The company is often confused with luxury automaker Rolls-Royce Motor Cars, but they are not connected.