Act as a senior SEO content writer with 5+ years of experience using Ahrefs for keyword research. Create a step-by-step guide on how to use Ahrefs to find high-potential keywords for [BLOG POSTS/WEBSITE CONTENT/E-COMMERCE PRODUCT PAGES]. Include specific tips for analyzing [KEYWORD DIFFICULTY (KD), SEARCH VOLUME, and CLICK-THROUGH RATE (CTR)] metrics, as well as how to identify [LONG-TAIL KEYWORDS] with low competition. Provide examples of actionable insights, such as filtering keywords with a KD score below [X] and search volume above [Y]. Explain how to use Ahrefs' 'Parent Topic' feature to uncover content clusters. Format the guide as a beginner-friendly tutorial with screenshots from the Ahrefs dashboard.