Need working tutorial for Training Model

Hi, I´m new here, so … please sorry any eventual error about where and how ask help.
About Train model with personals images, all those tutorials I found on web (video and text), they forget some step, because all DreamBooth Colab, always give me Error at certain points (always different errors), even if I repeat and repeat again and again, follow all steps.
is there a simply and clear tutorial for train models, that works fine and explain because eventual errors?
Many thanks