SSL certificates is your way of knowing that the site you are browsing is encrypted.
Look for the padlock icon.
If your website is not encrypted Google will take a dim view of your site and warn users that the website is unsafe or malicious. This is a massive over-reaction. You do however need to see the padlock when you are buying things with your PayPal or credit card. Many sites are static and do not perform transactions. Google does not care. It wants all websites to have an SSL certificate.
Google is placing more importance on whats called RESPONSIVE websites in their search engine results. Older sites, maybe your current live site, were only designed to opened on a desktop computer. These days, websites need to perform well by opening properly on any device be it a normal computer screen, a tablet or one of the many smartphones we all have today. Thats called being RESPONSIVE.
How to lose three days buried in Joomla. Do the right thing, keep client sites uptodate and for the second time this year be rewarded with a bite on the bum that will takes days to stop hurting. To make Joomla even better this update made J Mail [forms] very tight and safe. This sadly also means very uncompromising. Any settings not totally correct and client enquiry forms do not deliver. No warnings. Just silence.
The quality of the relationship between a client and his or her web developer has a lot of bearing on how good the finished site will be. Too often the horse is put before the cart or as you will see below, the racing car before the racing driver. Let me explain. The client looks to the web dev person to do the work. Thats fine. But whose driving whom?