Please elaborate on models and valuation models done at BBs?

I am currently working with a role where I do a specific type of modeling, so I am a bit less knowledgable about the details of modeling at most bulge brackets for industry coverage groups.

If you can elaborate a bit on what your modeling process is like, that would be great. Feel free to elaborate on valuation models, M&A, LBO, etc.

I'd like to know things like if you use a template and how much prior knowledge I would need to have to complete a model accurately. I currently have knowledge of how to do a variety of modeling, which is why I ask how much more I would need to know.

Thanks!