The Sacramento (California) public law library has an organized and easy-to-use list of probate law resources that is extraordinary. In the index is a listing of information about probate law topics which include wills, trusts, estate planning, estate administration, conservatorships, and guardianships.
Specifically, the resources and references include:
Legal Encyclopedias & Law Summaries
Statutes & Court Rules
Within each of these listed topics are numerous and very helpful sub-categories worth looking at.