Thanks for replying.
It's mostly for example, when adding features to the server like DotNet 3.5. Some guides say check everything under that option, others only say to check a couple settings. Same for IIS web server. I decided to check everything under the main heading for each feature just to be safe. Also, I started using Hasleo System Backup to create checkpoints along the way. For example, creating a system back up after installing AD and setting up the domain. Then another backup after extending schema, adding features, prereqs and ADKs. This way if something goes wrong during the config manager install, I can go back to a previous state. I'm trying to be more methodical and really looking to understand SCCM/MECM from the ground up. Your guides and others are really good. It's just me that needs to slow down a bit and understand what I'm doing.