I learned how to make a short gif from a youtube video today from a website name Imgur.com. Then press upload image then scroll down and press gif. Then copy and post a youtube video of your choice, afterwards you can choose a certain scene. then copy from the share,later copy and past the gif into the post like this one below.
press add media and upload the gif and make sure the size is full when inserting the post.
This app allows an individual to create their own gif with their own interest in mind. Also inside of the other website. you can use Giphy.com in order to create an gif.