I am teaching SEO in Maidstone, Kent. There are lots of questions! We are about to talk about the big changes happening in Google on April 21st.
Here is a Google page which shows you whether your website is mobile friendly:
As previously mentioned, Google is making big changes on April 21st and there may be adverse effects on your rankings if your site does not work well within mobiles. Any questions just ask. Our resident expert Ben @admin is always happy to answer questions about responsive websites, CSS code etc.