What is PicoCTF?
picoCTF is a free computer security education program with original content built on a capture-the-flag framework created by security and privacy experts at Carnegie Mellon University.
It has training available for those who want to learn more about computer security. I just signed up today and followed along with this youtube to do the first challenge. For me it was VERY easy, so don’t be afraid to dive in. You don’t have to have any prior knowledge or experience to jump in. You can use any operating system (Windows, Mac, Linux). They have everything you need to do this first CTF.