Often times when I open a new buffer, it is with the intention of moving to
a particular line. For example, if I am trying to move to line 55 in the
file, then I will hit 55j*. This works fine when I am dealing with a
freshly opened buffer. That is, this works fine if I am starting from the
top of the buffer.
In general, there is a better approach. I can move to an exact line number
from normal mode with :{N} where {N} is the line number. So, if I want
to get to line 55 regardless of where I am currently positioned in the
buffer, I can simply hit :55<cr>.
* This actually is slightly inaccurate, it moves me to line 56, not 55.
If I need to be precise, 55j doesn't cut it.
** Also, I can apparently use 55G to achieve the same thing
(source).