Orc;
1. don'l allow melee creeps attack you while you creep and you are ranged.
2. don't make dual barracks
3. don't make tower outside your base but inside (cuz it is easily destroyed)
Ud;
1. Don't take aura first on DK
2. Maximise Death coil not aura.
3. don't cast useless coils, use coil to finish unit off.
4. don't make 3 crypts, one is enough. Atleast vs orc.
5. don't lose hero to creeps