If you don't know how, you shouldn't be relaxing your hair.
However, if you insist:
The answer is yes & no. No matter if you have natural hair or relaxed hair if you don't take the time to properly care for it will be unhealthy. There are benefits to natural hair and relaxed hair but it really depends on your preference. Choose the option that best for you.
I also have relaxed hair and I make extra sure I stay away from anything with alcohol or sulfates. Relaxed hair NEEDS sulfate free shampoos so it can stay smooth and not dry out!
Not necessarily; there are people with natural hair who simply have slow growth & it is actually very possible to have healthy relaxed hair. Growth has to do with genetics, vitamins, & hair care.
You can straighten your hair whether or not it is relaxed.
you can always go to the hairstylist and get your hair treated & relaxed, instead of being a home hairdresser, get professional help.
You take care of natural hair how you would take care of relaxed hair. Keep it moisturized, clean by shampooing it, & conditioned. Use less heat & you could also switch to all natural hair care products. Don't use any chemicals & that way it stay natural.
Keratin treatments will not work on already relaxed hair. Applying this treatment to relaxed hair could result in breakage and damage to your hair.
It just means your hair is relaxed; hair that has been treated to remove all curls and waves.
You have two options. To grow it out or cut off the relaxed hair.
That depends on how frequently you do it. You hair does not become "un-relaxed" after time. You have to touch-up the newgrowth & if you want your hair "out," you have to cut your hair.
It shouldn't be needed, but you can; however, do not do it shortly after as the hair is already somewhat damaged from being relaxed.
No. Not at first, anyway. Do not go swimming immediately or soon after having your hair relaxed.