I'll never know how to work with rar files
Hello!
To open .rar file you can use a program like winrar for example! :)
https://www.win-rar.com
There's also an online extractor if you don't want to download a new program:
https://extract.me
It's exactly like .zip files if you have already used them :)
You just need to extract them and then you will have everything ready :D
Let us know if we can help more :o