Where can I find the Qiskit tutorial as a pdf?

The Qiskit documentation is included in the Qiskit Github repositories, so if you clone the Qiskit repositories locally, you'll have full access to the documentation offline. Alternatively, you could use something like HTTrack to download and access the documentation website offline.

The Qiskit textbook is probably the best resource for learning Qiskit. There is also a nice set of Qiskit tutorials here, and the documentation itself includes a set of tutorials.