Salesforce practice resources
ApexSensei publishes drills, practice exams, a blog, and books you can open without connecting a Salesforce org. This page also links a Developer Edition signup list, a SOQL builder, and a short governor-limits table.
Apex drills
Read every public drill, including starter code, then open it in the app when you want to run it.
Practice exams
Sample questions for Admin, Platform Developer I, and Agentforce Specialist.
Blog
Short guides on Apex, SOQL, testing, and working as a Salesforce developer.
Books
Learning Apex and Learning LWC, in Kindle, paperback, and hardcover.
Developer Edition signup
Official signup links, with Developer Edition first because that is where the drills run.
SOQL query builder
Pick an object and a few fields, then copy a SOQL query.
Apex governor limits
SOQL, DML, rows, and CPU, with one sentence each and a link to the bulk drill.