I enjoyed re-reading Foundation and plan to continue to read the others in the series. As I've grown older I've become more appreciative of history and how it has shaped our lives, so reading about a science fiction setting where people effectively write the history they want to have is just fun.
The principles of psychohistory, the statistical study of masses of humans to predict their behavior, was fascinating and today's real-world applications of data science scratch at similar concepts. Of course, this is a science fiction book, but it nonetheless explores the what-if: what-if this psychohistory were real and could be applied on human civilization at large?

For a more in-depth review, check out my blog: strakul.blogspot.com/2021/08/book-review-foundation-by-isaac-asimov.html