Harry learned those things from the Pensieve, along with a lot of other things we didn't specifically see. For instance, a memory from the Pensieve is the reason Harry could tell us about the conversation between Dumbledore and Snape.
I'm not sure exactly how Dumbledore blunted the knives in the Dursley house. Maybe it's just one of the effects of a general anti-suicide jinx that ze placed on the house.
Approximate readability: 9.14 (327 characters, 71 words, 4 sentences, 4.61 characters per word, 17.75 words per sentence)
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