Top "Applicationpage" questions

How to Create a custom Application Page with webparts for sharepoint in VS2010?

I am very new to Sharepoint, and I am not 100% sure if this is the correct way to do this …

sharepoint web-parts applicationpage
HTML placeholder attribute is not a valid attribute

On SharePoint application page I am using placeholder in <input> like this: <input type="text" id="name" …

html sharepoint-2010 placeholder applicationpage