These are some useful tips that are categorized based on the different types of users commonly found online.
Following these tips will help to keep you more secure and safe while online
E-Commerce Users
Do not give out your financial details to any one but trusted websites
Use a firewall and an antivirus to prevent trojans and key loggers
Use a spam filter as it will detect most fraud mails (Recommended: AVG, Zone labs)
Change your passwords frequently, and check your account details daily for any thing strange
Prefer transacting via https pages
Use only trusted services such as E-bay, Pay pal etc for conducting transactions