Training Dataset Format

Just want to ask a question regarding the dataset format i need to have for training, seeing there is already all the code necessary for training, evaluation, and everything, i find it weird that i cant find an easy step-by-step guide to train my own model, i am confused.
1. Any example of training dataset format?
2. How do i properly train the model using my own dataset? which file should i run with what arguments?

All the "guides" i found regarding training my own dataset is very vague and not guide-like, this is really making it hard for newcomers who doesn't know deep things.
My point is, is there any straightforward step-by-step guides, where there is no complex explanation and "GO FIND IT HERE", i am not asking for complicated stuff, just a simple guide of example of dataset, which file to run with what args to train ur own model and save it