Nutrition is not one size fits all.
Nutrition is a key component of a healthy lifestyle and any successful fitness program. Properly fueling your body is necessary for energy to train with intensity, improve your health, and recover between activities. Everyone's "perfect" nutrition plan is different so it will take you some trials and errors to find what will work to get the results you're looking for. Be real with yourself when you decide on a nutrition plan. A plan that is hard to maintain or creates pressure is not realistic. Being realistic means setting small, achievable goals to create habits for long-term success.
Get to know your body.