This is just a bit from my notes:
Oberth
- Development of liquid-fuelled rockets
- Developed idea of multi-staged rockets – shedding compartments of rockets
- Advanced ideas on space exploration – space suits, space stations, electric spaceships & space-based reflecting telescopes
- Wrote many books concerning space–space exploration, generated interest in space exploration
It's not that detailed because I mainly focused on Tsiolkovsky but I hope it helps hahaha