Remember that the right click menu is selection sensitive, if you want to explode a group or component you have to select one first or explode will not show up in the right click menu…
It’s the same for a lot of other tasks like dividing a line or reverse faces.
Start with learning SketchUp before adding any plugins, to master the tools first. You’ll most certainly benefit from learning the ins and outs first before installing plugins.
Another source for good tips etc. To help achieve your goals, some time spent on the SketchUp YouTube channel (https://www.youtube.com/user/SketchUpVideo/playlists) will be very worthwhile. The site is also from the SketchUp team. Pay attention to the Square One Series and Level UP series. They cover the basics for each tool.