Funny but restarting your computer will cure many ills. What if that doesn't work? Here is a few bits of advice you can try to get you back up and running.
Internet not working?
If websites don't load try a different browser. If you use Google Chrome try Microsoft Edge, Opera or Firefox. Sometimes when a web page is created its developed with only one browser in mind and others don't work well or at all.
If you are having problems with your internet not connecting try right clicking on the network icon and choose "Troubleshoot problems".
How to stay safe online
Do I really need an anti-virus program? What is the best anti-virus program? The internet is full of lists of top 10 or to 5 programs to use and every one is different. This video will give you so solid advice on how to navigate what to look for and how to be safe while surfing the internet.
Software to avoid. Some of these are even anti-virus programs.