When trying to work on Reports themselves focus on https://developer.mescius.com/activereportsnet/docs/latest/online/report-authors.html
This will contain how to use the Standalone Designer, WebDesigner and cover some report design basics.
If you are new to AR, look at https://developer.mescius.com/activereportsnet/docs/latest/online/quick-start.html for a quick start to how to get AR up and running in your environment.
Beyond this there are several sections to cover specific issues or areas you may want to use from AR.
For samples, you can look to our Github (Link)or start with looking at
https://github.com/activereports/samples18
and
https://github.com/activereports/websamples18
There are also live demos of some reports found on https://developer.mescius.com/activereportsnet/demos/
For detailed documentation for each control on a report check in these locations:
https://developer.mescius.com/activereportsnet/docs/latest/online/report-controls.html
When you have the documentation open, you will have a search bar in the top right. This will only search within the docs site for the version you are on. If you want a different version check on that versions docs site. If you use the search on the main MESCIUS page you may get a mix of different results from other sources that don't pertain to the documentation, such as blog posts.
Logan McCarthy