How could I say "It's fine" or "It's OK" in Hindi?
For example, a person bumps into me by accident and say "sorry" how could I say "It's fine"?

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like the above answers you could say "koi baat nahi" (no problem)
if someone asks if you're ok you could say "mein theek hoon" (im ok)

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koi baat nahi.....its ok or thats fine

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its fine - sab theek hai 
i m ok - main theek hu

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कोई बात नही   koi baat nahi

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koi baat nahin