Steps :
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Clone this repository example: git clone https://github.com/mumtahinafaguni/mumtahinafaguni.github.io.git
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edit the source as you wish
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create new repository with .github.io example : someone.github.io
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Select Initialize this repository with a README
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Under the repository name click setting
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follow the url in presnt in "GitHub Pages"
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whalla . Your portfolio is onlne
https://help.github.com/en/github/working-with-github-pages/creating-a-github-pages-site