How to use the graphics in ruby 2.5? Or better use RoR for this?

Question

What gems to install? Maybe there are good lessons on the subject?

Answer 1

What do you need to do exactly?

If you only need to make some graphics you can do them with JS: https://frappe.github.io/charts/

Edit: I put the link and the reference to Frappé Charts because I do not know what you are referring to. And I assume that by RaR you meant to say RoR (Ruby on Rails). If you intend to do something else like a GUI or a Ruby Game, you can do it also (wxruby, Gosu, chipmunk, gtk3 and other gems, keep in mind that none will work in CodePlayground).