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.
Search volume based on trends is ever-changing. Twitter, YouTube and news aggregators are great resources for identifying popular trends. Take advantage of trends in your field as well as trends in business, technology, local, pop culture and world events to promote your product. You can garner significant web traffic by beating your competitors to the punch.
Some generic words like flowers, for example, may be associated with a wide variety of ideas, images, concepts and instructions. The extent of this term matches very little (or no) market demand, but what happens if I forgot that tomorrow is my wife’s birthday? Urgent search appears for emergency needs. Instead of searching for ‘flowers’ or ‘flowers delivery’ I could look for ‘flowers delivery 24hs’ or ‘flowers delivery same day'.
The higher the search volume for a given keyword or keyword phrase, the more work is typically required to achieve higher rankings. This is often referred to as keyword difficulty and occasionally incorporates SERP features; for example, if many SERP features (like featured snippets, knowledge graph, carousels, etc) are clogging up a keyword’s result page, difficulty will increase. Big brands often take up the top 10 results for high-volume keywords, so if you’re just starting out on the web and going after the same keywords, the uphill battle for ranking can take years of effort.
You can more strategically target a specific location by narrowing down your keyword research to specific towns, counties, or states in the Google Keyword Planner, or evaluate "interest by subregion" in Google Trends. Geo-specific research can help make your content more relevant to your target audience. For example, you might find out that in Texas, the preferred term for a large truck is “big rig,” while in New York, “tractor trailer” is the preferred terminology.
Keyword research is a constant process. Trends change. Seasons change. Popular terms and catch-phrases change. SEO and marketing agencies are a great resource for ensuring that keyword research is done on a regular basis. You should refresh your research at least quarterly, ideally monthly, to stay ahead of your competitors. Partnering with a reputable SEO agency is a great way to ensure you’re always ahead of your competition.
The highest number is the one that would give you the most potential return. If you have a big-time domain and can rank pretty easily on competitive keywords, start at the top. If you’re a newer, smaller site and can’t really play with the big guns yet, it might make more sense to start in the middle of the sorted keyword research list – these aren’t the “monster” keywords in your niche, but they’re also less competitive, and therefore easier to rank on.
I recently decided to go with ahrefs after using spyfu for a couple years and trialing secockpit. I was a moz client for awhile too about a year ago. I found spyfu data to be sketchy (or just plain wrong) fairly often, and moz, I don’t know, just didn’t seem like they were really into supporting what I wanted to know. secockpit was achingly slow for a trickle of data. ahrefs isn’t nearly so graph-y as spyfu, but they are so blazing fast and the data is so deep. I enjoy it a great deal, even if it is spendy.