Objects are a general term used for the basic and fundamental items that are used by GDevelop (Sprites and variations, Drawing, Text, Particle and Light):
I’ve read through a few of the posts you’ve made over the past week. Unfortunately it seems like you’re missing some of the basics of the engine. I know you’ve asked for videos, and while there are many videos going over all of the basics in the engine itself, at this point it sounds like you need to read through the engine documentation in the wiki.
Then proceed to read each entry in each section on the left, without skipping any pages within each section. This will teach you about objects, variables, the scene editor, and all of the parts of the engine.
This is supplementary and goes only through the basics however, and you will still likely need to read through the wiki after going through the playlist. After learning the engine, you will need to come up with the game logic you want by putting those pieces together.
Once you have a better understanding, it’ll also be easier for you to look through the examples in the engine and understand how they’re built, to better use them as additional learning tools.