Here is a list of links to CSP Blog posts that I think are suitable for a beginner: read them in the order given.
How to Create a Simple Cyclostationary Signal: Rectangular-Pulse BPSK
The Cyclic Autocorrelation Function
The Spectral Correlation Function
The Cyclic Autocorrelation for BPSK
The Spectral Correlation Function for BPSK
The Frequency-Smoothing Method of Spectral Correlation Estimation
The Time-Smoothing Method of Spectral Correlation Estimation
The Spectral Coherence Function
Estimation Quality: The Resolution Product
Blind Cycle-Frequency Estimation: The SSCA
Blind Cycle-Frequency Estimation: The FAM
Computational Costs of Second-Order Estimators
A Gallery of Spectral Correlation
Verification Guide for Second-Order Estimation
This list leaves out all the posts on higher-order cyclostationarity, all the posts on machine learning, all the posts that present reviews of published technical papers, and a lot of advanced or niche topics. See the Highlights post for a guide to those posts, or just load cyclostationary.blog and read from the bottom up!