All three books I've co-authored are freely available online for non-commercial use:

#Bayesian Data Analysis, 3rd ed (aka BDA3) at https://stat.columbia.edu/~gelman/book/ and lectures plus #rstats, #Python and #Stan code at https://avehtari.github.io/BDA_course_Aalto/

#Regression and Other Stories at https://avehtari.github.io/ROS-Examples/ including #rstats and #Stan code

Active Statistics at https://avehtari.github.io/ActiveStatistics/

The websites also have links to the publishers' web stores if you prefer hard copies of these