I attended the Keysight Technologies RF Back to Basics workshop in November 2019. The workshop was a very good review of RF analysis. I'd like to thank Walter Meissner for generating this list of useful links.
KeySight - Find Presentations
KeySight - The RF/Microwave Signal Chain
KeySight - Network Analysis
KeySight - Signal Analysis
KeySight - Signal Generation and Digital Modulation
KeySight - Why Accuracy Matters
KeySight - Fundamentals of RF Simulation
KeySight- [AN154 - S-Parameter Design Application Notes (KeySight)
SSSMag - AN154 - S-Parameter Design Application Notes(Agilent)
HPMemoryProject - AN154 - S-Parameter Design Application Notes (HP)
Hawaii.Physics - S-Parameters Theory and Techniques (HP)
SETILeague - Microwave Amplifier Design (HP)
UIUC.EMLab - App Notes (links)
Wikipedia - Scattering Parameters (S-Param)
KeysightLit - Distributed Components (Agilent, 2003)
IEEE.Xplore - E. Hammerstad and O. Jensen, "Accurate Models for Microstrip Computer-aided Design," MTT Symposium Digest , 1980.
SourceForge.NGSpice - BSIM 3 ver 3.3 Manual
Wikipedia - Cross (X) Parameters (X-Param)
UIUC.EMLab - Intro to X-Parameters (ECE 451)
KeySight - Advanced Design System (ADS) Software (30-day free)
KeySight - Advanced Design System (ADS) YouTube video library
KeySight - Webinar Series
KeySight - RF Learning Center
KeySight - Signal Generators
KeySight - Spectrum (Signal) Analyzers
Keysight - A-Series FieldFox Analyzers - N9927-90001
Keysight - B-Series FieldFoxAnalyzers - N9938-90003
KeysightLit - Test Techniques, i.e. Accuracy
Keysight - Calibration Services - YouTube videos
Keysight - Uncertainty Calculators
KeysightLit - Optimizing Spectrum Analyzer Amplitude Accuracy (AN 1316, Agilent)
KeysightLit - Spectrum Analyzer Measurements and Noise (AN 1303, Keysight)
Keysight - Fundamentals of RF and Microwave Power Measurements (AN 1449) link to PDFs
KeysightLit - Fundamentals of RF and Microwave Power Measurements (AN 1449 Part 1)
KeysightLit - Fundamentals of RF and Microwave Power Measurements (AN 1449 Part 2)
KeysightLit - Fundamentals of RF and Microwave Power Measurements (AN 1449 Part 3)
KeysightLit - Fundamentals of RF and Microwave Power Measurements (AN 1449 Part 4)
KeysightLit - Revisiting Mismatch Uncertainty with Rayleigh Distribution (White Paper)
KeysightLit - High-Accuracy Noise Figure Measurements Using PNA-X NA (AN 1408-20, Keysight)
KeysightLit - Active Device Characterization in Pulsed Operation Using PNA-X NA (AN 1408-21, Keysight)