On the CoCoRaHS website, there is an interactive map where every single report from every station is a colour-coded dot depending on how much precipitation was reported that day, from zero to however high the precipitation is. You can zoom out and see a complete map of North America and see all of the reports that were done for that day, or you can zoom in to where you are and you can click on every single dot on the map and it tells you exactly what was reported, and if there were any comments.
There are different things you can report. Every observer has a manual rain gauge, which is a graduated cylinder with a funnel on top and an extra outer cylinder to catch overflow. Reporting what is in the rain gauge is necessary in order to submit a report, but there are other things like snow depth, 24-hour snow accumulation and snow water equivalent reports. There are also different types of reports there.
If you want to get involved, you can do something as simple as just go outside, check your rain gauge, see that you got one centimetre of rain yesterday, enter it and, boom, you're done, or if you are more interested, you can do condition monitoring reports, all different sorts of snow measurements or make big comments about the temperature, the timing, the wind speed. All of that is visible just on the map by clicking on a dot, so if you were curious about what happened in Nova Scotia yesterday....
When Hurricane Fiona was happening, we had wonderful reports from observers who had really detailed comments about what was happening.