Seems like a crazy amount of architecture. Does AWS keep all this stuff organized in some way, or will my personal experiments in Lamba accidentally break this

Seems like a crazy amount of architecture. Does AWS keep all this stuff organized in some way, or will my personal experiments in Lamba accidentally break this because it's all merged together? Say I've installed this. I now want to write my own lamba service to handle contact form POSTs or something. Then I decide to delete it, but I accidentally delete one of these crazy email things. What happens?