"./" files

As a somewhat new member, I understand that the practice is to name one's
first/home page "./", and that this file must be in the root
directory.  However, if one wishes to design several small websites, one
clearly cannot name all the individual home pages "./".  How does
one get around this?  Does using "indexA.html", indexB.html" etc work?  Or
"index1.html" and "index2.html" etc?  Nowhere can I find any written
guidance on this point. [So far, of course, I have not uploaded any draft
pages to actual web sites].  I would be grateful for practical guidance.
Thanks

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