How to run a Ruby on Rails server?

Question

Ruby on Rails

I want to install the Rails framework for Ruby. My Linux Mint 18 system had Ruby version 2.3 and required at least 2.4. I installed rvm with big problems, using it I updated ruby ​​to 2.5. Installed rails, tried to start the server, gave an error with instructions to do bundle install (done). Everything went without errors. Sqlite3 version 3.11.0 is installed. Rails 4.2.6. I got confused in the errors I got. There was a Stack level too deep error. I googled that I need to edit the gemfile. I specified newer versions of gems in it, it gives the following error:

resolver.rb:55:in `rescue in start': Bundler could not find compatible versions for gem "activesupport": (Bundler::VersionConflict)
In snapshot (Gemfile.lock):
activesupport (= 4.2.6)
In Gemfile:
rails (= 5.2.1) was resolved to 5.2.1, which depends on
activesupport (= 5.2.1)
sass-rails (~> 5.0.7) was resolved to 5.0.7, which depends on
railties (< 6, >= 4.0.0) was resolved to 4.2.6, which depends on
activesupport (= 4.2.6)
...

Where and what needs to be corrected, tell me? And then I'm completely confused.