The <ul> tag defines an unordered (bulleted) list. Use the <ul> tag together with the <li> tag to create unordered lists.
<ul>
<li> Coffee </li>
<Tea>
<ul>
<li>Black tea</li>
<li>Green tea</li>
</ul>
</li>
<li>Milk</li>
</ul>
I found this tag at W3Schools
The <footer> tag defines a footer for a document or section. You can have several footer elements in one document. Footer element shoould go inside a <address> tag.
The HTML <input> tag is used to represent a form input control in HTML document. This form input control facilitate user to input data and communicate with a website or application. Let's take an example of an HTML form with three input fields, two text fields and one button for submission.