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I don't know how to make a good GIF per say but the dividers was simple enough, just use one of them already there drop it in photoshop remove the middle logo and replace it with whatever you want and change the colour of the divider

a gif is just a animated set of still images put to a timespan. If you can create the images you want it is really easy to organize them and export it as a GIF. I build Web applications, but I am terrible at creating images myself. Here is some tools, hope you find it helpful! Also I would recomend looking at Blender, but it would not be a great tool for gifs, but is very powerful and useful for creating still shots to build your gifs with.

https://medium.com/@fluperofficial/create-your-own-gif-with-top-5-animated-gif-software-c4a7766cfbaf