Read the below articles and book chapters:

Craniovertebral Junction: Normal Anatomy, Craniometry, and Congenital Anomalies
Imaging of the Central Skull Base
Chapter 6: "Diagnostic Imaging of Metastatic Nodal Disease" in Diagnostic Imaging in Head and Neck Cancer
Imaging-Based Nodal Classification for Evaluation of Neck Metastatic Adenopathy
Skull Vault Lesions: A Review
The Preoperative Sinus CT: Avoiding a "CLOSE" Call with Surgical Complications

Review the below Radiology Assistant websites on bone anatomy and pathology:

Anatomy 2.0: Anatomy and related pathology
Pathology

Read the following articles:

Imaging of the sublingual and submandibular spaces
Imaging in infections of the head and neck
Paranasal sinus imaging
Imaging the oral cavity: key concepts for the radiologist
Imaging evaluation of the suprahyoid neck

Read the following articles:

Imaging of Submandibular and Sublingual Salivary Glands
Radiolucent lesions of the mandible: a pattern-based approach to diagnosis
Common pediatric head and neck congenital/developmental anomalies
Infrahyoid Neck
Imaging of the temporomandibular joint: An update