@Marie Z. Read the book the 16% Solution to get the beginning basics.
Attend sales, network with people at the sales.
If the countries around you give a basics class before the sale, attend those.
Read your state law several times and again 1 or 2x a year as you will see something different each time you read and as you gain experience.
https://leginfo.legislature.ca...
See if the counties you have interest in have websites like this...https://www.solanocounty.com/d...
I always say be very very careful with the national road show classes that come thru with a free 2-3 hour seminar and then 3 day training. Often they don't really know well enough your local situation to teach you really how to do it. They're also great at selling you software, more training, and coaching/mentoring....that will for sure extract a good deal of money from the participants. I'd rather see you learn by doing, investing that $30,000 or so and making some mistakes, than just spending it on education and ending up with nothing but a little knowledge.
You can also check out LAREIC https://lareic.com/ or maybe if you live somewhere else another local club. Ask there who the tax lien/deed experts are and ask if they have training. Hopefully they can put you in touch with local people who are experts.
Good luck.