think Like a thief

A wise man once said, to catch a thief, you have to think like a thief

I prefare Start learn about pentest before get in deep at blue team field

Get the hacker tools and technique

don't worry i wil explain more why you need to learn this .Thinking like a hacker helps you to know where the attack might come from, what are the ways a hacker might infiltrate your organization, what techniques and tricks they can use .

ejpt course will help you to get this knowledge 
Jr pentest from THM as will
Ebrahim Hegazy course

Sans sec 504

Hacker Tools, Techniques, and Incident Handling

for now start from book number 2 to the end of the course 
bool n 1 we will handel it soon

لا تنسي الصلاة على النبي ﷺ