Self-published sources are generally not considered reliable: i.e. anyone can't just write a web page or a book and start quoting themselves on Wikipedia. That's clearly objectionable!
Recognized domain experts who are routinely published in respectable journals is one of the main exceptions.
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Wikipedia insists on secondary sources. Primary sources are not considered acceptable IIRC.
Self-published sources are generally not considered reliable: i.e. anyone can't just write a web page or a book and start quoting themselves on Wikipedia. That's clearly objectionable!
Recognized domain experts who are routinely published in respectable journals is one of the main exceptions.
Some relevant policy: https://en.m.wikipedia.org/wiki/Wikipedia:Verifiability#Self...
You can use primary sources. There are rules about them and a preference for secondary sources, but no blanket ban.