Will upgrading to Yosemite remove all my tweaks and setting? I've made many small tweaks and preference customization to the Mavericks install on my Mac. If I upgrade to Yosemite, will those tweaks and preferences be reset and would require me to re-apply them?
In general, no. Most of your settings will remain intact, but some of them may be reset or irrelevant in Yosemite.