CSS object names

[shudocan]

Sorry for my obvious ignorance.
I want to style the output pages different than the default.
In wordpress I can use the custom css in customizer to add code to all or some pages.
For example, if I want to make certain text bold or a different font or justification or color.
But I don't know the names of the objects?
If someone would write a couple styling examples and list the names of the containers or objects? then less technical users could style the output. Like me =)