I just downloaded Android Studio, and while I was trying to familiarize myself with the setup, I accidentally closed the Component Tree. I’m at very beginner level, and in all of the results I’ve come across, I didn’t understand or it didn’t work for me. How do I find the Component Tree again?
If you mean the “Component Tree” of the XML preview, this can be collapsed & expanded alike all other sidebars; it might be at the bottom-left of the XML preview window, where “Palette” is. It just sometimes requires double-clicking, in order to expand that panel. I tried, but I didn’t manage to hide or remove it; if it is really missing, the Android Studio installation might be broken (needs reinstall).