​السلام عليكم ورحمة الله وبركاته Can you please explain, what is the true meaning of "Manhaj", like people say His Aqeedah and Manhaj are correct. And should we judge (not takfir) people based on it?

Manhaj means the way and the methodology. The way and the methodology that every Muslim should follow is that of the Messenger and the companions (may Allah be pleased with them). When we deviate in this, of course, it can be called out and pointed out that these are mistakes or even deviance. A person is judged based upon his Aqidah and methodology.