Show to the user some technical articles taken from a knowledge base. Use the Mission Control's Content Management System to add support articles, the plugin will index all the knowledge base and anwer to user questions.
Example:
Changelog
1.1.0 - Simplification and bug fixing
1.0.1 - Cleanup
1.0.2 - Fix translations
Installing plugins it's easy: open Mission Control (https://your-bot.com/mc or locally http://localhost:1880/mc) and then go to the plugins section and click on "install" (some plugins could include a Node-RED flow to import).
Be sure to enable Mission Control in RedBot / Node-RED and enable it in the bot configuration, read a complete tutorial here.