While the distros have their own ways to hand-hold and guide users, all have loads of avenues to offer support and a large community that helps you resolve any issue.
Slackware is the only project that has an email address where you can send general support questions. The project has mailing lists for announcing new releases and for sharing security issues, but nothing for support. Instead of hosting its own support forums, the project directs users to the very active Slackware sub-forum at LinuxQuestions. The project also maintains a list of companies all over the world that offer paid technical support services. In terms of documentation, Slackware has an online book that hasn’t been updated in quite a while, but most of it is still relevant thanks to the nature of the distro.