An SSL certifcate is an absolute must. Even if you are not giving visitors a login, for them to access certain areas of your site - getting an SSL is essential now and does help in boosting your trust and help in ranking higher. For ecommerce sites and other sites that provide login areas - its an absolute must, or users of chrome will see a "red screen" while they access your site.
I use Ahrefs to find ideas for keywords to add into content, and content to create around keyword opportunities. I like how Ahrefs shows keyword difficulty, search volume, traffic potential (how much organic search traffic it’s possible to get when you rank #1 for a parent topic keyword) and lets you group keywords together to create lists. It’s really useful.
To use this feature, click on the second tab that you will find on the top right bar. Type in the keywords that you want to view the performance of, and also type in the name of your domain. Hit the search button and allow the software to find whatever you are looking for. Site rank will analyze the top page of Yahoo, Google, and Bing to find where your site could be. Jaaxy will also show you how your post or page is performing, so you will know if it is climbing or dropping in the search.