A great tutorial on adding Social Media to your site
It specifically talks about WordPress – but you can apply these tips to other types of sites as well – https://wp.smashingmagazine.com/2012/01/19/facebook-twitter-google-wordpress/
And a great tutorial on using HTML5 and CSS to style a form – https://line25.com/tutorials/create-a-stylish-contact-form-with-html5-css3