html - string in Ruby on rails questions: 1. <code> 2. how to recognize "put"? -

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i'm developing web application ruby on rails.

when command 

<h4>wow webpage <code>loving each other</code> good</h3>

, "loving each other" part highlighted ( , meant because learned code can work through getbootstrap! ) : "code" "code" <---- in stackoverflow page code code command working put here intentionally in wrong way.

i wanted make specific string data that. in application, string data 

<textarea class = "form-control" name="input"></textarea>

but when displayed in html, <code> part not recognized sort of code string. partially seems make sense not understood. how can turn type of information formatted version ( meaning part highlighted! )

second question that, string data got <textarea> has "entering actions" meaning, user clicks "enter" couple of times. when display information (for instance, @a = user.information, <- user.information has couple of sentences equal information ), enters don't appear , sentences messy :(

i think there sure way properly!!! looking forward hearing opinion experts!

while rendering should this:

"<h4>wow webpage <code>loving each other</code> good</h3>".gsub('\n','<br/>).html_safe

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