you could try 'man' ... if you have it there is always the online documentation that soalris gives you, or you could try online at Suns own web site ...
apart from that you could try searching for the specific problem in a general search engine ...
solaris is a big thing ... if you want basic commands there are lots around, look for solaris faq on the web you'll find it somewhere ... if you want in depth, then you can find it online but you might be just as well buying a book ...