A few resources I've been using to study for the technician license:

Older (third edition) of the ARRL manual:
http://w2sbp.weebly.com/uploads/6/5/...nse_manual.pdf

Very concise study guide:
https://www.kb6nu.com/wp-content/upl...guide-v1-1.pdf

Practice Exams (free registration required):
http://arrlexamreview.appspot.com/index.html

And other practice exam / study site (free registration required):
https://hamstudy.org/