Questions regarding Classdef - functions

I have come across the following terms/functions when exploring a class builtin MATLAB and I would like to understand the code behind the class and not just use it blindly. Below are some of the things I couldnt understand.

1- properties (Nontunable)

2- matlab.system.StringSet

3- function set.SampleRate(obj, Rs)  

4- if isa

5-methods(Access = protected)

6-  matlab.system.display.Section

7- matlab.system.display.internal.Property

Can anyone please help me understand in few words what does each one mean?

Thanks

[per isakson]

Search the documentation. Here is a start

• 4- &nbsp isa, Determine if input is object of specified class
• 3- &nbsp Property Set Methods