What is your goal here? Are you looking to just tinker and learn? Or are you looking for something to slap your name on and give to prospective employers to say "See I worked on this project"?
If you are just tinkering/learning then I would suggest cracking some of the vulnerable vm's over at vulnhub.com
If you are just tinkering/learning then I would suggest cracking some of the vulnerable vm's over at vulnhub.com