A few tips to start:
you start playing your first game don’t be too focussed on
the tree types of your opponent. Don’t forget to check the
number you have left of the tree types of your own colour, too.
2. Be aware that making a high stack with
a Tzaar costs you pieces of the other types. Your opponent will
chase your Tzaars, so you will loose some of them any way. You may
just as well jump on your own TZAAR-pieces to build a strong TZAAR-stack.
3. A strong stack is powerful, sure, but
only if you can keep it in play. A high stack with limited mobility—or
no mobility at all—is not worth all the moves you invested
in building it.
4. It is always good to isolate one piece
of one of the tree types—isolate in the sense that you cannot
make a move with it any more. It is one piece less to play with,
but it also implies that it does not risk to be captured any more.
It is safe, meaning that you have no worries any more to protect
the type it represents.
5. Don’t forgot to switch from the
first objective (capturing the last piece of one of the tree types)
to the second well in time. After having played a number of games,
you’ll notice that the outcome of a game often depends on
the possibilities you have left to make a capture. In that stage
stacks of 2 pieces are very handy!