Hi @hamza,
It’s great to hear that you want to contribute to the documentation!
As described in the announcement about our new documentation site, you can now easily click the “edit” button while reading our docs to take you directly to the source files in Github where you can raise a PR with additions or edits.
And here is a more detailed guide to submit documentation edits/fixes: https://github.com/dhis2/dhis2-docs/blob/master/src/commonmark/en/content/common/submitting-a-doc-fix.md
Thanks again!
Karoline