Help! I need to educate myself quickly about coeliac disease.
There will be a new friend spending time in my house and I will need to feed this (young) person quite frequently. I prefer to cook home made meals but also occasionally use prepared stuff and shortcuts. e.g.I make a lot of soup and have just discovered stock cubes are a no-no! 
This person has really severe coeliac so I have to be very vigilant and I am so ignorant about it.
What do I need to watch out for on ingredients lists? Are there sneaky pitfalls to watch out for? Any suggestions for suitable teenage food are welcome.
Going out for the day but I will check in later. Thank you for any help.