Make sure you are washing your hair in four or more sections for easier detangling. If you are doing wash n go's, apply whatever products to each detangled section, fluff/shake and go. If you are doing twistouts/braid outs, twist each section in whatever size twists you like and allow to dry completely. The key IMO to wash n goes/ twist outs is to manipulate the hair as little as possible once hair is set. I baggy nightly when I wear wash n go's so as to achieve 2-4 day hair. In the morning, I remove the baggy, spritz with water, shake n go. No combing/manipulating. easy peasy. Same thing with twistouts, you should only have to put a bonnet on at night, and then shake/finger-comb your hair out in the am, no combing/brushing. Save that for wash day.
If you are straightening your hair, do a good moisturizing DC, rinse and apply a good heat protectant pryor to blow-drying/flat-ironing, and start on a lower heat setting, as you can always increase the setting to acheive the desired results. This helps to avoid heat damage. Try wrapping/cross wrapping your hair at night, and then brush out in the morning to maintain your straight hair. Add a lil serum/oil for shine, but go easy on products heavy in water or your hair will revert.
HTH.