Ho letto un libro che parla di ottimismo e pessimismo.

Questions & Answers about Ho letto un libro che parla di ottimismo e pessimismo.

Why do ottimismo and pessimismo end in -ismo, and what Italian words are they built from?
The suffix -ismo is used to form abstract nouns describing an ideology, attitude, or belief system. In this sentence, they are built from the irregular superlative adjectives ottimo (very good or best) and pessimo (very bad or worst).
How would we describe a person who practices these attitudes using the -ista suffix?
You drop the -ismo and add the suffix -ista, creating ottimista (optimist) and pessimista (pessimist). Keep in mind that -ista nouns have the exact same ending for both masculine and feminine in the singular, but take normal gendered endings in the plural (ottimisti for masculine, ottimiste for feminine).
Why does the sentence use parla di instead of parla su for 'talks about'?
The verb parlare strongly prefers the preposition di to express the topic of a conversation, an article, or a book. While English uses 'about', translating that directly to su or circa here would sound unnatural.
Italian normally requires definite articles for abstract concepts. Why aren't they used before ottimismo and pessimismo here?
Although abstract nouns usually take definite articles in Italian (as in L'ottimismo fa bene), the article is commonly dropped after the preposition di when specifying the general topic or category of a book, discussion, or academic course.

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