Matlab/simulink can be masterd easily just with the help of youtube tutorials and the matlab/simulink help tool where you can find everything you need with an examples other than this any further sources are also not required.
Basic Elements
There are two major classes of items in Simulink: blocks and lines.
Blocks are used to generate, modify, combine, output, and display signals.
Lines are used to transfer signals from one block to another.
To open the Simulink Start Page, in the MATLAB Toolstrip, click Simulink.
On the Start Page, click the title of a template to expand the description.
Click the down arrow next to Create Model and select Set As Default.