A full suite of all-in-one SEO tools with a free account option that works well if you only work with a single website.
The list of tools which semrush provides: Keyword Research, On-page SEO, Competitor Analysis, Content Marketing, Local SEO, Rank Tracking, Social Media Management, Link Building, Competitor SEO Analysis, Content Creation and Distribution, Content Optimization, Content Marketing Analytics, Market Analysis, Paid Advertising, Competitor PR Monitoring, PPC Keyword Research and Website Monetization.
Keyword research is the process of determining words and phrases that may be worthwhile to optimize for organic search. The goal of keyword research (KR) is to find keywords and phrases used by a website's target audience when performing web searches.
Keyword research is performed by taking a small selection of keywords which are highly relevant to the target website then expanding it by brainstorming, analyzing existing site content and using software tools to generate additional keyword suggestions.
To reach the target audience through organic search, the keywords discovered during the keyword research phase must be incorporated into a website; this is a process known as on page optimization.
Including keywords in page titles, link anchor text and page content - all of which are indexed by search engines such as Google, Bing - creates a link between a website and the keywords which its target audience may search for.
A core input to many search engine algorithms, such as the PageRank algorithm developed by Brin & Page, Domain Authority developed by Moz is the quantity and quality of hyperlinks pointing to a webpage.
After a website is optimized for search engines, webmasters can turn their focus to generating inbound links to their website in order to improve its organic search rank.
The success of link building is measured by counting the quality and quantity of links acquired through this work.