// 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 convert a decimal number to binary, divide it by 2 repeatedly and write down each remainder, then read the remainders from bottom to top. For example, 13 ÷ 2 gives remainders 1, 0, 1, 1, so 13 in binary is 1101.
An ISO week number counts the weeks of the year under the ISO 8601 standard: every week runs Monday to Sunday, and week 1 is the week that contains the year's first Thursday (which is always the week containing 4 January).
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