You might ask: Why search for an Apex tutorial PDF when Salesforce provides free online trails on Trailhead?
Structured curriculum. Search Google for "Apex Tutorial" filetype:pdf site:.edu . Several universities that teach Cloud Computing have public Salesforce modules. These PDFs are often the best structured because they progress from Week 1 to Week 8. apex tutorial pdf
A: Yes. Salesforce publishes the "Apex Developer Guide" as a free PDF. However, it is 2,000+ pages. It is better as a dictionary than a textbook. You might ask: Why search for an Apex