You can add a capture device, you can capture your own desktop, a window, you can even add GIFs, images and videos and resize them or drag them through the screen.

The software was using a lot of ram on my laptop at first, but after tweaking the settings a bit, it became really lightweight. About video, the settings for streaming are useful if your internet connection it's not too good or if your PC/laptop it's not the most powerful out there. On audio, you can set different audio tracks, separate them and record them. I like to think about OBS as a solution for basic or minimalistic projects. The whole package its free to use, while limited sometimes, if you learn how to set it up (Wiki and guides are really useful on the official website), you're good to go. I used a lot of streaming software at first, skipping OBS for no reason, but when I tried the software I was in awe. I started using OBS while doing a film series in my city, the project was open to the public, but the pandemic forced me to turn the thing into an online project.

Although it may take a while to learn, i found it an excellent investment. It brings new life to your remote teaching, providing effective solutions and keeping students involved and entertained. and switch shot by just pressing a shortcut key (e.g.: F1 is the close-up, F2 is the external co-host, F3 is the Powerpoint presentation, etc.). The whole thing can be connected to Zoom, Teams, Skype etc (OBS may start a 'virtual camera' that you can choose as a video source within each of those softwares). Features are almost endless, but you have to learn about them via the product's forums and install them as separate addons. You can set up multiple shots (close-ups, half-length, etc.) and bring multiple elements into your scene (e.g., another computer screen to use as background, an external camera, even a co-host that is broadcasting via his/her cell-phone and that you can put next to you on the same screen!). OBS Studio is a free video editing software with lots of helful functions for live sessions.

Obs studio stable release