i have diastasis racti, how the method can help? should i avoid something?
There's definitely no quick fix for diastasis recti. It's one of those common ailments that just makes every movement slightly riskier.
The Gokhale Method gives your body the strongest possible foundation for rehabilitation and helps protect you from further injury by reestablishing your primal posture.
Twisting, bending and twisting, and bending and lifting are three particularly risky movements with weak abdominal muscles. My most basic advice would be to move your torso as a unit: your ribs and your pelvis should not be doing different things.
Beyond that, if you are willing to put in the time and effort to reform your posture, taking the Gokhale Method Foundations course will be more effective at protecting you against further injury than any set of exercises. It's everything else that needs to be fortified around your abdominal tissues, to give them time to heal.