Learn Italian: Ogni sistema artificiale impara velocemente. - Every artificial system learns quickly.

No, sistema is actually masculine! It is one of several words of Greek origin ending in -ma that are masculine in Italian. Other common examples you might already know are il problema (the problem) and il programma (the program).

Could I say Tutti i sistemi artificiali instead of Ogni sistema artificiale?

Yes, absolutely! Ogni means "every" or "each" and is always followed by a singular noun without an article. Tutti i means "all the" and is followed by a plural noun. So Ogni sistema and Tutti i sistemi mean essentially the same thing, just like "every system" and "all systems" do in English.

Does the adjective artificiale change depending on the gender of the noun?

Adjectives ending in -e, such as artificiale or veloce, have the exact same form for both masculine and feminine singular nouns. They only change their ending to -i when they become plural, which would be sistemi artificiali in this case.

How exactly is the adverb velocemente formed?