Watch out for links to fake websites. Which are usually naughty, don't be tempted! They'll install spyware on your computer and other nasty stuff that you do not want!
What I recommend:
- Use FireFox, it is said to be the safest browser available (but this may not be true as its getting alot more popular now)
- Use a good AntiVirus software. I use AVG Free. (scroll down till you see "Windows" or whatever operating system you use) Its free and does a great job. Make sure you update it regularly too!
- Use a spyware protection program. I recommend Spyware Doctor (It should automatically ask you if you want to download but if it doesnt it says "click here") But I dont think its free (you can still use it though its just not all available to you). That may have changed since I last updated.