Childnet is a great resource for parents and children on online safety.
Think U Know has a wide section for parents and covers topics such as gaming and talking to strangers. You can also search by topic or age range to find information that is relevant for your family.
Internet Matters is another useful site to use with advice on cyberbullying, how to talk to your children about internet safety and quick guides to different types of social media such as Instagram and Snapchat. Internet Matters have published new research to support parents in relation to online gaming. Read the report here.
UK Safer Internet Centre provides e-safety tips, advice and resources
NSPCC The Share Aware campaign provides information for parents about online safety