This sarga is basically the whole promise of Ramayan. In verses 1 to 22 we got to know about Rama; his character and his family. The verses from 23 to 100 tell us about all the important persons and events Ramayana. We will be touching every event in future so I will list only those which are missed.

1. Rama killed a rakshaka named Viradha and met like Sharbhanga, Suteekshna, Agastya and Sudarshana (brother if Agastya)
2. Sage Agastya gave him Indra's bow, a sword and 2 quivers. The arrows on these quivers replenished and they were never empty.
3. While he was in Dandaka forest (Janasthana) he killed about 14,000 demons including Trishira, Khara, Duushana in battle.
4. After Sitaji was abducted by Ravana, Rama while searching for Sita, killed Kabandha, a demon who before proceeding to heaven told Rama to meet Sabari.
5. Rama then met Hanumana and then all the events took place from Vali Vadha to Lanka Vijaya to Rama's rule.

This sarga basically gives you a gist of the whole of Ramayana. This is also called Samkshepa Ramayana or Baala Ramayana.

Sources : https://www.valmikiramayan.net