Your scalp and your hair lengths can have different needs. Paying attention to both can help you choose a wash routine that feels clean without treating every head of hair the same way.
Notice your own pattern
How quickly does your scalp feel oily or uncomfortable? How do your lengths feel after washing? The answers can help guide how often you shampoo and where you apply conditioner. Activity level and the products you use may change the pattern.
Keep care gentle
Work shampoo into the scalp using your fingertips and rinse well. Avoid scratching with your nails. Persistent itching, soreness, flaking or a sudden change deserves professional advice rather than repeated product experiments.
Review your styling products
A buildup of styling products can change how the scalp and roots feel. If a product seems to cause discomfort, stop using it and consider whether your routine needs a simpler wash rather than adding another treatment.
Further reading: American Academy of Dermatology.