Car seats and strollers .

So i am looking to put these items on my registry but i dont know how i should do this . I really wanted a forever car seat but i also want to be able to take the car seat in and out of the car, which they do not recommend for the forever car seats .So i wanted to know what car seats you all recommend who are already moms . Im looking for something with longevity . And if you used a stroller did you put the car seat in it or did you wait until baby was big enough to be in it without the car seat.? Thank you for any and all input ladies !