Here you can find some useful websites that explain how to carry out certain analyses in SPSS.
SPSS tutorials | The Ultimate Guide to SPSS (spss-tutorials.com)
The website below is very useful but the full package costs. Therefore, there is no overview page of all available statistical tests and how to perform these in SPSS. Below you find an example page for a regression analysis. For all other statistical tests, please use google to see whether statistics.leard has a manual available for free.
Finally, this website provides a theoretical overview of different tests and how to conduct these in SPSS. Just type the test you would like to use into the search bar.