لَوْ is a conditional particle. In this lesson it describes a past condition that was not fulfilled.
لَوْ زَرَعْتَ لَحَصَدْتَ
If you had sown, you would have reaped.
The speaker is not reporting that sowing happened. The sentence imagines the result that would have followed if it had happened.
لَوْ ذَهَبْتَ لَذَهَبْتُ
If you had gone, I would have gone.
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Conditional Sentences with إِذَا and لَوْ
لَوْ is a conditional particle. In this lesson it describes a past condition that was not fulfilled.
لَوْ زَرَعْتَ لَحَصَدْتَ
If you had sown, you would have reaped.
The speaker is not reporting that sowing happened. The sentence imagines the result that would have followed if it had happened.
لَوْ ذَهَبْتَ لَذَهَبْتُ
If you had gone, I would have gone.