|Posted by DescentOnARope|
To expand on that, learning with cheap gear will allow you to know what you're looking for when you decide to upgrade. I did alright with my D3300, but if I had known then what I do now, I probably could have done better if I had only known about the other factors to be considered.
Really until you do your homework, learn as much as possibly about the gear and shoot with it extensively you won't know it's true capabilities.
Going cheap on glass comes back to haunt you with crappy bokeh, flaring, slow/bad AF locks, chromatic/barrel distortion, fringing and missed keepers.
I never regretted buying any of my L glass.
Get good glass the first time if possible... it will last a lifetime if cared for.