I want to

Learn Excel

If you want to learn how to use Excel, take a look at Easy Excel which provides you with access to tutorials which cover all aspects of the software. You can read about the basics, functions, data analysis and variables. There's also 300 examples to help you out. It's also entirely free, supported by adverts. Not something that I need to know, but this could be a real help if you need to understand something quickly. 

Free animated backgrounds for your website

Vidlery gives you access to about 30 different animated backgrounds that you can use on your webpage. Musicians, a plane taking off, teacher, birds, rocket, couple walking and more. It's a very niche interest, but they are all entirely free, so you can do whatever you'd like to with them.