These should be credible websites e.g. .edu Internet domain (e.g. website of my university is http://www.us.edu.pl/). You should be authorized to upload some content there. That is why gschoolar is sometimes considered to be more credible then RG where you need no authorization to upload anything. Since I don't know scholarly institutions in your country it is difficult to me to suggest proper web platforms. Below I give a detailed instruction from google scholar guide:
If you're an individual author, it works best to simply upload your paper to your website, e.g., www.example.edu/~professor/jpdr2009.pdf; and add a link to it on your publications page, such as www.example.edu/~professor/publications.html. Make sure that:
the full text of your paper is in a PDF file that ends with ".pdf",
the title of the paper appears in a large font on top of the first page,
the authors of the paper are listed right below the title on a separate line, and
there's a bibliography section titled, e.g., "References" or "Bibliography" at the end.
That's it! Our search robots should normally find your paper and include it in Google Scholar within several weeks.
If it doesn't work, you could either (1) read more detailed technical guidelines in this documentation or (2) check if your local institutional repository is already configured for indexing in Google Scholar, and upload your papers there.