[turtles]need assistance with my automatic turtle miner

I'm writing a turtle program which I hope would go out and mine 50 blocks, turn around, come back the same distance, then drop its inventory and move the right turn and repeat. I will have a line of obsidian pipes to recieve the drops. I get,

while true do
local amountOfTimes = 50
for 1,amountOfTimes do
turtle.dig()
turtle.forward()
turtle.digUp()
end
turtle.turnRight()
turtle.turnRight()
end
local amount2 = 50
for 1,amount2 do
turtle.forward()
end
for i = 1,16
turtle.select(i)
turtle.drop
end
turtle.turnRight()
turtle.forward()
turtle.turnLeft()
end
end

the error i'm getting is :15: '<name>' expected

the main thing i'm unsure about is how to do the loops, i.e, the ones with for and the ones which are turning it around.

1: For 1 Needs to be for i = 1, amountOfTimes
2: turtle.drop needs to be turtle.drop()
3: You don't need 2 ends at the end of the code
4: break after turnRight()

amountOfTimes = 50
while true do
for i = 1,amountOfTimes do
turtle.dig()
turtle.forward()
turtle.digUp()
end
turtle.turnRight()
turtle.turnRight()
break
end
for i = 1,amountOfTimes do
turtle.forward()
end

for i = 1,16
turtle.select(i)
turtle.drop()
end

turtle.turnRight()
turtle.forward()

why do we use break? i've seen it before.

while true do
break
end

It "breaks" the loop.
Stops it, gets rid of it.

It's used for functions like reading

while true do
  input = read()
  if input == "poop" then
    break
  end
end
os.reboot() -- When it breaks the loop it resumes the program

That would reboot if you typed poop.

The fixes for the turtle work up when it must drop the items, it says :19: attempt to call nil. I believe this is because it tries to drop in an inventory space where no items are present. what must be done?