What makes a tutorial worth converting
A good tutorial has structure: numbered or sequential steps, code blocks at each step, occasional inline images, and recap sections at major milestones. That structure is exactly what HTML mostly preserves badly and Markdown preserves natively. Our extractor recognises the common tutorial conventions: <ol> step lists become Markdown numbered lists, <h2> "Step N" headings become ## Step N, code blocks keep their language hints, image alt text travels with the image reference. The result reads like a printed handbook chapter, not a web page.
Why this beats bookmarking
Bookmarking a tutorial requires the source site to stay up, the URL to remain stable, the formatting to not break, and your internet to work when you sit down to follow along. Saving the converted Markdown into your notes vault (Obsidian, Logseq, plain folders, a Git repo of "things I've learned") gives you a permanent local copy you can read on a plane, annotate as you work through it, and grep across months later when you remember "I did this once but I forgot the third step". If the tutorial is itself a PDF, see PDF to Markdown instead.
Where this is highest leverage
Long-form coding tutorials (Real Python, Smashing Magazine, dev.to, freeCodeCamp), DIY guides (iFixit teardowns, instructables), recipe sites (the recipe itself, not the food-blogger preamble), and any "build X in Y" walkthrough where you'll be referring back as you go. Skip ads, skip the video, get the steps.