The video is the most important element of a crowdfunding campaign. Supporters want to get to know you and your project. It doesn’t need to be a professional video - you can even use a webcam or a mobile phone. Just make sure the clip introduces you and your idea authentically.
On most computers, a video editing software is already installed. e.g. Windows Movie Maker or iMovie. These tools are easy to use and are generally sufficient for editing. You can download more free software here: DaVinci Resolve, Shotcut or Directr.
The images and photos on your project page should capture the idea, look great, and attract the attention of the crowd. Your project image is the first part of your project people will see - and the first impression is of course really important.