If the elisp intro doesn't suit your prefered style of learning two alternatives are to search the index in the emacs or elisp reference manual you access by
-
f1 r
-
f1 R elisp
then you followup in the case of elisp with "I excursion" to list the index topic on that keyword excursion as an example; better to look for blogs on the web as a first step to find the solution to your immediate need