Short answers, pulled from the story.
The Forum Boarium occupied a level piece of land near the Tiber River between three hills: the Capitoline, the Palatine, and the Aventine. This specific spot served as the original docks for Rome itself.
Ancient dwellers on the Palatine hill dedicated an altar to Hercules after he arrived with Geryon's oxen. The tufa stone core of the original altar now sits inside the church of Santa Maria in Cosmedin.
Marcus and Decimus Junius Brutus Scaeva organized gladiatorial combat in 264 BC to honor their deceased father. Three pairs of fighters participated in this event which marked the first gladiatorial contest held in Rome.
The Temple of Hercules Victor dates from the 2nd century BC and stands as the earliest surviving marble building in Rome. The Temple of Portunus was built between 100 and 80 BC with four free-standing Ionic columns at its front.
Four victims were buried alive under the Forum Boarium in 215 BC following reports of great disaster. A Gaulish man, a Gaulish woman, a Greek man, and a Greek woman filled a stone vault beneath the ground.