A recommendation from the "Boglehead" community within personal finance circles is this book, which is a good primer for getting started with investing. https://www.bogleheads.org/blog/portfolio/the-bogleheads-guide-to-investing/
It includes a discussion highly germane to Americans, but it may also be broadly applicable in aspects such as managing risk and timescales, especially the difference between younger investors with the capacity and time horizon to save, versus late-starters with less time available for compound interest to work its magic.
This is the book I lend to friends, and would recommend.