2) SEMrush- This tool offers fantastic competitive research around domains to find what keywords could be driving traffic for your competitors. Looking at paid keywords ad spend can also help you know which keywords might have monetary value worth pursuing organically. If a competitor is willing to spend a high ad budget on terms and you think they do a good job running their ad campaign, then its a good indication it is worth organic ranking effort.
Internal Links can spell the difference between leads that you can encourage to convert to a customer. Internal Linking Audit should make you well-versed in determining which URLs are relevant to your site. Check it by making sure that you are linking to the correct page version, most of which are in an HTTP/HTTPS format. Link on absolute URLs and do not forget to link to canonical page versions.

For the price of membership to Wealthy Affiliate you get access Jaaxy, hundreds of training videos, step by step training plans, A site builder tool and too many other features to mention here. The Wealthy Affiliate monthly membership fee is much less than the Jaaxy Pro fee ($49) and you get access to a ton of useful tools including Jaaxy. I have a review of WA that will walk you through all the bells and whistles including the version of Jaaxy that is included.
By quality of the post we are basically talking about the overall authority and ability to engage. A post with low quality will eventually get lower engagement levels by users and that signal will be passed down to Google eventually - that will result in loss of overall quality score of the site. Churning out content that is put out for the sake of driving blog post numbers and not the users - is a failing strategy.
Once you’ve profiled your customers, it’s time to brainstorm what topics your target audience is interested in. What topics are people searching for related to your business? “Google suggest” is a wonderful resource for brainstorming keywords. Google will predict queries based on audience patterns and, by doing so, reveal popular search queries. Social media, YouTube and Wikipedia also similarly reveal search trends by attempting to complete your queries. Do not forget about on-site search! You may have a wealth of topic data in your own analytics. Your website analytics will reveal what your customers are searching for on your website.
Negative SEO is basically when someone sends a ton of spammy, low quality backlinks to your site. The goal is to get Google to think your site is low quality because of all the crappy sites linking to you, and eventually devalue your site. There are actual companies that get paid to do negative SEO on behalf of their clients. It sucks, but it's reality.
The total number of backlinks and their quality pointing to your complete website result in the overall authority of your domain. The external links that all point to a specific page will help this page to rank in the search engine results (SERPs). The relevance and quality of an external link are very important factors when you like to measure the impact / value of an link. To find out more about quality links have a look at this article on: the Official Google Webmaster Central Blog – https://webmasters.googleblog.com/2010/06/quality-links-to-your-site.html
If the pages you’ve created don’t rank for the keywords you’ve selected, you should re-evaluate your content strategy and adjust. If your page isn’t generating organic traffic, focus on less competitive keywords. Unfortunately in reality this is pretty common. The good thing is, you’ve collected a lot of actual keyword data at this stage. Adjust your keyword strategy and use this data in your advantage.      
However, this does not mean you cannot topple them. It just takes more of an effort in terms of content as your page has to build the trust. That is why you will see the "Google dance" happening for fresh content from a site that is not yet trusted or is not very authoritative. Google gives your page a chance and measures user click-throughs when it pushes you to certain spots in the SERPs and then measures user engagement levels when the traffic hit your site through those positions in the SERPs.