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http://core.ecu.edu/psyc/wuenschk/spss/SPSS-MV.htm
This is a very useful source composed of multiple links for Multivariate Analysis with SPSS. If you want to learn more about how to make multivariate analysis using SPSS, this site is a golden opportunity for you. In the links provided, the analyses are explained in every detail even showing you step by step which icons to click in the SPSS program.
http://www.csulb.edu/~msaintg/ppa696/696regmx.htm
This is a useful link for multiple regression. It discusses the elements of multiple regression discussing the key terms such as B coefficient, standardized beta, and R squared. It offers simple formulas and exercises to facilitate comprehension. It also identifies the problems associated with multiple regression.
https://www.psychologyinaction.org/psychology-in-action-1/2011/10/30/what-is-a-confounding-variable
A summary of confounding variables with everyday examples to illustrate this problem in multivariate analyses.
https://www.tylervigen.com/spurious-correlations
This website gives examples of random things which are correlated to illustrate spurious relationships between variables, and remind us that correlation is not causation!
https://utopiayouarestandinginit.com/2014/06/17/examples-of-spurious-relationships/
More examples of spurious relationships, with arrow diagrams to illustrate how factors are connected.
https://www.youtube.com/watch?v=ElkCTFkAGXY
A YouTube tutorial on OLS regression in SPSS.
https://www.youtube.com/watch?v=zj15KUXtC7M
This video shows you how to run a binary logistic regression in SPSS, and how to interpret the tables SPSS produces.