Drain the chickpeas thoroughly and spread them on the bottom of the salad bowl, then add the remaining salad layers: peeled and chopped cucumbers, halved cherry tomatoes, diced bell pepper, red onion cut into strips, and diced or crumbled feta.
Prepare the tzatziki sauce: peel the cucumbers and grate them on a coarse grater, mix with garlic pressed through a garlic press, olive oil, lemon juice, Greek yogurt and a tablespoon of chopped dill. Season with salt and pepper and spread over the top of the salad.
Add the remaining chopped dill and sprinkle with halved olives.