Originally Posted by Jasmine1 View Post
is html knowledge is compulsory or not for a professional search engine optimizer
As anyone can set themselves up as a professional in SEO, so I don't think there is anything that is compulsory about it. I could be wrong (and someone please correct me if I am wrong) but I don't think there are any universally recognized qualifications in the field of SEO.
But in terms of carrying out SEO, whether amateur or professional, yes some knowledge of html is required. However, as this is mainly amending or adding to what is already there, you don't need to be an expert in it and there is plenty of help freely available online.