do you have a video on how to edit a video to make it look like I'm passing thru a locked door or doing a super hero take off ?

I'm a novice creator. Are these products with the buying.

Is it worth the effort to create a long form youtube video and then create a short youtube short for that same video ? I know it will take more time and effort to record and edit. Trying to run both a youtube and facebook strategy. Or would it be better to foucs on youtube shorts ? my goal is to build make content that i can use on multiple channels, grow the channel quickly and pump out content. I'm a realtor my niche is people that are going thru probate and are considering selling a home that they have inherited. What do you think Trevor ?

can a thumbnail be added to a youtube short

I'm having trouble finding auto cut out on the my desktop version of capcut. I'm using capcut pro and I'm guessing I have the most recent version. Where is the I've copied and selected the clip I want to cutout. I can not find that feature. Where is it ?