What is a one-sentence summary of the following article?
Products such as gels and serums can be great for getting your hair to do what you want, but too much can end up causing your hair to look greasy or “crunchy.” It’s always easier to add more than take products out! Roller-setting your hair can help straighten and smooth your hair with less heat than a curling iron or straightener. Use a heavy conditioner and completely detangle before using rollers. Magnetic rollers and satin-covered foam rollers will be kinder to natural hair than other types. Avoid velcro or mesh rollers at all costs, as they are prone to tangling and could break your hair. Protective styles such as braids, twists, and knots keep the hair secured, which cuts down on styling time and helps to take pressure off of fragile ends. There are many tutorials online that break down these styles into easy DIY steps. Good sources for styling advice include "Curly Nikki" and "Naturally Curly." Some protective styles, such as braids, can take hours to do and are best done by a professional hairstylist. Others, such as buns and twists, can be easily done at home. You can keep all styles looking fresh by spritzing them daily with a mixture of water, leave-in conditioner, and moisturizing oils such as olive oil or coconut oil. Even protective styles such as braids and twists shouldn't be left in longer than 12 weeks. Always deep condition and seal your hair after taking out a style.

Summary:
Apply styling products in layers. Use rollers to straighten and set your hair. Consider protective styles. Moisturize your hairstyle daily. Take out a style after 3 months.