* Study the First example: Counting.html
Download to desktop and open with an editor
Modify "xxx" strings and see their effects
Put it in your repo after the modifications

* Make a copy of the file for length conversion
There will be two input elements for inch and cm
When you change one input, the other is modified
Put it in your repo, use one digit accuracy
Make sure your work is correctly running
GitHub'a login yaptıktan sonra kendi reponuzu açınca 
"Upload files"a basın -- dosya eklemenin en kolay yolu bu

* Open settings (after login) in your GitHub repo
Find GitHub Pages and select Main branch
Click on the link that shows your GitHub Pages
Add the file name and your page will be running

* Send me the link to both of your documents

Ref: JS Tutorial