Try to make a modification that should be simple. For example, in a web app update the text shown when there is a validation error on the server side. Make the

Try to make a modification that should be simple. For example, in a web app update the text shown when there is a validation error on the server side. Make the modification, get it deployed and working on your local dev machine. This should take you around most high level areas of the system and in my experience show you just how nice or complicated of a system you just inherited.