While OBS is fantastic for capturing video, it doesn't offer comprehensive editing features you might be looking for, such as adding fade effects, transitions, or piecing multiple clips together.
For those tasks, you'll likely benefit from a dedicated video editor. Since you're just starting out, you might want to try a user-friendly option like Movavi
Mac Video Editor. This software offers a variety of features that are easy to get the hang of, yet powerful enough to create professional-looking edits. You'll find plenty of transitions, including the fade effects you mentioned, and you can easily compile different scenes into a seamless video.