For the manual and guide section of your product website
Making it easy for user to use and understand your products with as little stress as possible, is of great advantage to your business than anything else. You can easily achieve this by making sure your website link points to a .GUIDE domain. Using such a domain name ending will make it easy to locate this page.
For DIY and instructional website
Do you run a website that deals with teaching and instructing people on how to do thing themselves? Buying a .GUIDE domain name for such a website will further drive more traffic to your website.
For counseling and mentoring website
To be successful everyone needs a mentor. Provide mentorship and counseling service to people in need of your guidance through your website registered on a .GUIDE domain name.