In the video game Destiny, the Traveler is described as assisting humanity and ushering them into their Golden Age. During this Golden Age, humanity had incredible technological advancement, and were able to reach and colonize multiple other planets.
Before the Traveler, earth's technology is fairly close to ours.
However, after the Traveler arrived, humanity quickly expanded to other planets, building multiple futuristic colonies.
How exactly did the Traveler help humanity? Did it directly give them technology or designs for technology? Did it somehow make humanity smarter or better at understanding science? Or did it do something else?
Destiny is rather (in)famous for having a limited in-game story. What story there is is mostly shown through online Grimoire cards. So this could be a difficult question to answer.