is Runner file of application, connects app with http server through verbs and path including erb files (views)
through local or instance variables defined in server file
trough erb. 2 types of tags <% %> either with our without = sign. with desplays the result of ruby evaluation without only evaluates code.
It comes in in form of hash called params. data is accessible via keys which can be called as string or symbol
params is the hash containing data from user coming in through forms
Looks good