When doing a site audit, a requirement from it was that we minify our JavaScript and CSS files.  We are on AEM cloud, what is the recommended way to accomplish this.  

I would like to use the entered value of startime as the minimum date in endtime's minDate field.  Is this possible and if so how? 

I have a page template I need to validate the StartDate field input is before the EndDate field input.  If it is, an error message needs to display and don't let the user create the page.  What is the best way to accomplish this? 

In our AEM website, we want to display a “Leaving Website” page when a user is leaving our domain.  What would be the recommended way to code this?

I am very new to AEM and was wondering what is the best way to create a button to show/hide a text field?  Do you alter the existing button or create a new one?  Is there a code example?