Tour doesn't work in trunk currently (to be Tiki 19) since the switch from Bootstrap 3 to 4, in a quick test of an existing tour. The first popup appears but the second doesn't. But according to the Bootstrap Tour site (https://github.com/sorich87/bootstrap-tour/issues/554) it should work so the library needs to be updated and then Tour retested.
The following is a list of keywords that should serve as hubs for navigation within the Tiki development and should correspond to documentation keywords.
Each feature in Tiki has a wiki page which regroups all the bugs, requests for enhancements, etc. It is somewhat a form of wiki-based project management. You can also express your interest in a feature by adding it to your profile. You can also try out the Dynamic filter.