// notes/
Coding tips and build notes by Mahir Faysal, a student web developer in Bangladesh: tested Python, HTML, CSS, JavaScript and PHP tutorials, plus notes from my Next.js and Gemini projects. Sample posts are marked and drafts stay in the admin area.
To check SPF, DKIM and DMARC, look up three DNS TXT records: SPF at the domain itself, DMARC at _dmarc.yourdomain, and DKIM at selector._domainkey.yourdomain. Use nslookup or PowerShell on Windows and dig on Mac or Linux, then read the results line by line.
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This view is only the category, tag, or search you asked for. Sample warnings still apply on any article that carries them. Drafts are still hidden. The full list is the learning notes page, which also explains how a note is written and why some posts are marked Sample.