Did Nostradamus predict anything?
No verified prediction of a specific future event has ever been demonstrated in advance. Every celebrated "hit" has been identified after the event, by interpreting deliberately obscure verse to fit what already happened.
What he actually wrote. Michel de Nostredame (1503–1566) was a French apothecary and astrologer whose Les Prophéties (1555) contains around 942 four-line verses called quatrains, grouped into sets of a hundred.
The verses are written to resist specific interpretation:
Multiple languages mixed — French, Latin, Greek, Italian, Provençal, and invented words.
Anagrams and wordplay, allowing names to be extracted after the fact.
No chronological order, so any verse can be assigned to any era.
Almost no dates, and the few that appear did not produce the predicted events.
Generic disaster imagery — fire, blood, plague, war, the fall of great men — which describes a very large proportion of human history.
The mechanism behind the apparent hits is retrofitting. Given hundreds of vague verses and thousands of years of events, matches can always be found. This is combined with:
Translation liberty. Popular versions frequently translate ambiguous words in whichever direction fits the claimed event, and some circulated verses are outright fabrications not in the original.
Confirmation bias, remembering matches and ignoring the overwhelming majority that fit nothing.
The famous Hister quatrain is the standard example. Read as "Hitler" by later interpreters, Hister was in fact the Latin name for the lower Danube, appearing in geographical works of the period. Nostradamus used other river names in comparable contexts.
Verses circulated after 9/11 claiming to predict it were shown to be either fabricated entirely or heavily mistranslated, and one widely shared example originated as a student essay demonstrating exactly this vagueness.
What he was doing was a recognised Renaissance genre, drawing on classical sources and contemporary events rather than claiming clairvoyance in a modern sense.