To use the "Nice Tree Style" (from "nice tree style" by Jacob Hoover Vigly ), copy this code into your LaTeX document's preamble (before \begin{document}). You only need to do this once.
\forestset{
nice trees/.style={
delay ={ where content ={}
{ shape = coordinate , for siblings ={ anchor = north }}{}} ,
for tree ={ calign = fixed edge angles , calign angle =65 , l=1 em},
for tree={
parent anchor=south, child anchor=north, align=center, base=top,
inner sep=0pt, l=0ex,
before typesetting nodes={%
if content={}{
for parent={for children={anchor=north},calign=fixed edge angles,calign angle=60},
shape=coordinate, calign=fixed edge angles, calign angle=60,
}{},
},
},
},
}