If you had good income then it is good for you to invest 100$ everymonth not only in bitcoin there's alternative way on how you can invest your money altcoin is the best too, theres a lot this one thing for your don't put all your money in one basket think outside the box and you will be good as long as you can hold it tho then your fine , coz everybody knows that cryptocurrency is the future so why not we can invest ahead of time.