Combine all ingredients (except feta) into a bowl and mix.
Top with sliced feta.
Drizzle some olive oil over traditional Greek salad and extra oregano if you'd like.
Serve!
Notes
* You can combine everything except feta and olive oil and place feta on top and drizzle oil over. **Some areas also mix in small fish (e.g. anchovies). If you do this, since the fish is salty, I wouldn't add salt.