documentclass{article}
usepackage{tikz}
usetikzlibrary{trees}

begin{document}
begin{tikzpicture}[level distance=1.5cm,
level 1/.style={sibling distance=3.5cm},
level 2/.style={sibling distance=1cm}]
tikzstyle{every node}=[circle,draw]
    node [red] {1}
        child [red] {
        node {3}
        child { node {4} }
        child [black] { node {5} }
        child [black] { node {5} }
    }
    child {
        node {3}
        child { node {4} }
        child { node {5} }
        child { node {5} }
    }
    child {
        node {3}
        child { node {4} }
        child { node {5} }
        child { node {5}
          child [grow=right] { node (q) {$Rightarrow$} edge from parent [draw=none]
            child [grow=right] {node (q) {$textrm{2nd level arrow indicates here}$} edge from parent[draw=none]
              child [grow=up] {node (q) {$Rightarrow$} edge from parent[draw=none]
                child [grow=right] {node (r) {$textrm{1st level arrow indicates here}$} edge from parent[draw=none]
                  child [grow=up] {node (s) {$Rightarrow$} edge from parent[draw=none]
                    child [grow=right] {node (r) {$textrm{1st level arrow indicates here}$} edge from parent[draw=none]
                    }
                  }
                }
              }
            }
          }
        }
      };

end{tikzpicture}
end{document}

path (Root)  ++(3cm,0) node{Foo};

documentclass{article}
usepackage{tikz}
usetikzlibrary{trees}

begin{document}
begin{tikzpicture}[level distance=1.5cm,
level 1/.style={sibling distance=3.5cm},
level 2/.style={sibling distance=1cm}]
tikzstyle{every node}=[circle,draw]
    node (Root) [red] {1}
        child [red] {
        node {3}
        child { node {4} }
        child [black] { node {5} }
        child [black] { node {5} }
    }
    child {
        node {3}
        child { node {4} }
        child { node {5} }
        child { node {5} }
    }
    child {
        node {3}
        child { node {4} }
        child { node {5} }
        child { node {5} }
        };
   % Comments to each level
   begin{scope}[every node/.style={right}]
     path (Root    -| Root-3-3) ++(5mm,0) node {$Rightarrow$} ++(5mm,0) node {1st level arrow indicates here};
     path (Root-1  -| Root-3-3) ++(5mm,0) node {$Rightarrow$} ++(5mm,0) node {2nd level arrow indicates here};
     path (Root-1-1-| Root-3-3) ++(5mm,0) node {$Rightarrow$} ++(5mm,0) node {3rd level arrow indicates here};
   end{scope}

end{tikzpicture}
end{document}

begin{scope}[every node/.style={right}]
   xdeflevel{Root}  % Initial top level
   defrightmostnode{Root-3-3}   % Name of the node with greater x coordinate
   foreach text in {1st level arrow indicates here,
                      2nd level arrow indicates here,
                      3rd level arrow indicates here}
   {
      path (level -|rightmostnode) ++(5mm,0) node{$Rightarrow$} ++(5mm,0) node {text};
      xdeflevel{level-1}
   }
 end{scope}

documentclass{article}
usepackage{tikz}
usepackage{tikz-qtree}
begin{document}

begin{tikzpicture}[every tree node/.style={draw,circle},edge from parent path={(tikzparentnode) -- (tikzchildnode)},sibling distance=.5cm]
Tree [.node[red] (1) {1};
        edge[red]; [.node[red] (3) {3}; edge[red];[.node[red] (4) {4}; ] [.5 ] [.5 ] ]
        [.3 [.4 ] [.5 ] [.5 ] ]
        [.3 [.4 ] [.5 ] [.5 ] ]
      ]
begin{scope}[xshift=3in,every tree node/.style={},edge from parent path={}]
Tree [.{First level} [.{Second Level} [.{Third level} ]]]
end{scope}
end{tikzpicture}
end{document}

documentclass[tikz, border=5pt]{standalone}
usepackage{forest}

begin{document}
begin{forest}
  for tree={
    circle,
    draw,
  },
  arrow just/.style={
    tikz+={
      node [anchor=mid west] at (.mid -| e) {$Rightarrow$ #1};
    },
  },
  colour me/.style={
    draw=#1,
    edge={draw=#1},
    text=#1,
  },
  trail/.style={
    colour me=#1,
    for ancestors={colour me=#1},
  },
  tikz+={coordinate (e) at (current bounding box.east);}
  [1, arrow just={1st level arrow indicates here}
    [3, arrow just={2nd level arrow indicates here}
      [4, arrow just={3rd level arrow indicates here}, trail=red]
      [5]
      [5]
    ]
    [3
      [4]
      [5]
      [5]
    ]
    [3
      [4]
      [5]
      [5]
    ]
  ]
end{forest}
end{document}

documentclass{standalone}

usepackage{amsmath}
usepackage{istgame}

begin{document}

begin{istgame}
% tree
setistOvalNodeStyle{6mm}
xtdistance{15mm}{35mm}
istrooto(0)[draw=red,red]{1}
  istb[red]
  istb
  istb
  endist
xtdistance{15mm}{10mm}
istrooto(1)(0-1)[draw=red,red]{3}
  istb[red]{}{4}[center,circle,draw,fill=white,red]
  xtShowEndPoints[oval node]
  istb{}{5}[center]
  istb{}{5}[center]
  endist
istrooto(2)(0-2){3}
  istb{}{4}[center]
  istb{}{5}[center]
  istb{}{5}[center]
  endist
istrooto(3)(0-3){3}
  istb{}{4}[center]
  istb{}{5}[center]
  istb{}{5}[center]
  endist
% level comments
coordinate (z) at (3-3);
coordinate (w) at ([xshift=1cm]z);
node at (0-|w) [right] {$Rightarrow$ 1st level arrow indicates here};
node at (1-|w) [right] {$Rightarrow$ 2nd level arrow indicates here};
node at (z-|w) [right] {$Rightarrow$ 3rd level arrow indicates here};
end{istgame}

end{document}