Ahrefs, SEO Tools
Ahrefs has a lot of tools, for example:
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Site Explorer to analyze your competitors.
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Site Audit, audit and optimize your website.
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Keywords Explorer, find keywords your customers are searching for.
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Content Explorer, discover content ideas and link opportunities.
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Rank Tracker, track your ranking progress.
Ahrefs also provide some free tools to use which are very useful. Keyword Difficulty Checker, Website Authority Checker, Backlink Checker
If you want to learn SEO, Ahrefs' 7 blog posts are an excellent introductory guide. Highly recommended.The Beginner's Guide to SEO