If you are a Mac user then iMovie is a great and free editing program. It even allows you to do green screen which used to be notoriously fiddly, in fact it still can be.
So you know that filming with a green screen background means you can superimpose your subject, which could be you, on to any background. This is great as you can have the background of your choosing which can look more professional and also can help with your presentation. If you want you can have a background about what is being talked about and just like weather forecasters refer to what you have in the background.
What you need is a green background, you can use blue but green is more popular. The background can be something like a green sheet or a pop up one like I use in the video, these are more expensive but if you need to be portable or want to quickly set it up or put it away then this might be more useful. The pop up one also stretches the fabric leaving no creases. Editing with green screen is easier if it is flat. Even lighting also helps. It can look even to the eye until you look through the camera.
In this video I am too close to it, this is deliberate as I wanted to cast a shadow on the green screen as it is best not to have any shadows, however, iMovie handled it really well. The easiest way to get rid of shadows is to move away from the background.