adobe.com/lightroom
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Official Adobe Lightroom site offering product details for Lightroom (cloud-based) and Lightroom Classic, pricing and downloads, plus tutorials, tips, presets, and inspiration for photo editing.
More resources on Photo Editing (Lightroom)
lightroomqueen.com
Lightroom Queen is a practical guide to Adobe Lightroom, offering in-depth tutorials, troubleshooting help, and workflow tips for Lightroom Classic and Lightroom (cloud), along with downloadable presets and plugins.
Lightroom Killer Tips
Long-running Lightroom blog, started by Matt Kloskowski and now run by Scott Kelby's KelbyOne team, publishing short weekly tips and videos on Lightroom Classic catalog management, develop-module editing, and new features, so you can speed up everyday editing workflow.
The Adobe Photoshop Lightroom Classic Book
Scott Kelby's step-by-step guide to Lightroom Classic CC (2018 edition), organized around a complete photographer's workflow: importing, organizing the catalog, developing raw files, local adjustments, and exporting or printing. Afterward you can set up and run an efficient end-to-end Lightroom workflow.
Lightroom Classic: The Complete Guide
Twenty-lesson Great Courses video course on DVD in which Photoshop Hall of Fame member Ben Willmore covers Lightroom Classic CC from import and catalog organization through develop-module adjustments, local edits and export, so you can edit photos confidently and efficiently.