If you already know another programming language, you can try PCL[1]; it&#x27;s a decent introduction.  If you get stuck on something feel free to ask on IRC (#lisp on freenode).<p>There is a library called alexandria[2] that covers a lot of obvious missing-features from the standard library (e.g. emptyp to test for an empty sequence).<p>Lastly the hyperspec[3] is actually quite useful as a library reference.<p>1: <a href="http:&#x2F;&#x2F;gigamonkeys.com&#x2F;book&#x2F;" rel="nofollow">http:&#x2F;&#x2F;gigamonkeys.com&#x2F;book&#x2F;</a><p>2: <a href="https:&#x2F;&#x2F;common-lisp.net&#x2F;project&#x2F;alexandria&#x2F;draft&#x2F;alexandria.html" rel="nofollow">https:&#x2F;&#x2F;common-lisp.net&#x2F;project&#x2F;alexandria&#x2F;draft&#x2F;alexandria....</a><p>3: <a href="http:&#x2F;&#x2F;www.lispworks.com&#x2F;documentation&#x2F;HyperSpec&#x2F;Front&#x2F;Contents.htm" rel="nofollow">http:&#x2F;&#x2F;www.lispworks.com&#x2F;documentation&#x2F;HyperSpec&#x2F;Front&#x2F;Conte...</a>