Judicial elections are important but as they are not partisan they are difficult to find information on the candidates records. Is a candidate pro choice? How did they decide various key cases? Along with doing a search for each candidate's name to find their bio and perhaps more information, here are some links that might help learn more.
One caveat however, The State Bar was recently charged for "ageism" in that it declined endorsement of a 70 year old candidate who they had previously endorced. The laundry on that is yet to come out of the wash.
-Dorothy
Voters Guide to Judicial Elections
https://ca.lwv.org/lwvc.files/judic/
The State Bar of California
https://www.calbar.org/
League of Women Voters of California
https://ca.lwv.org/
Rate the Courts
https://www.ratethecourts.com/index.php