Where can I find good websites on the Roman Republic?
You ask for something other than Wiki. There are many good websites about the Roman Republic. In the “Sources” below, I have listed a few for you to browse. [1] The wsu.edu site describes the foundation of the Republic and its early history and structure, while Rome was still only a single-city state. From that opening page, you can click on further, leading you to Rome’s expansion to dominate central Italy, etc. [2] The vroma.org site offers a good structural view of how the Republican form of government in Rome was organized: who did what, etc. [3] The utexas.edu site is similar to [2], but without graphics. It may give you a clearer understanding of the Republican constitution. [4] The unrv.com site describes the fall of the Republic and the transition to Principate. It has links to related topics.