You gain the combined scientific and technological knowledge developed on Earth of the MCU. This includes the technology built by geniuses like Tony Stark, Bruce Banner, and Hank Pym, as well as the technology of Wakanda. You can build Arc Reactors, power armors, create nanotech, and even program advanced AI like Jarvis. With Pym Particles you can alter the size of objects and access the Quantum Realm allowing you to travel through time, space, and realities. You can also create the Super Soldier Serum, Extremis, and even reproduce what created the Hulk.
Additionally this comes with all general technological knowledge of earth of the 2020s. Naturally you can build upon this knowledge in order to build completely new technology.
Finally you possess a particular talent for adapting your technology to different situations which enables you to rapidly modify and upgrade your technology after learning about an existing problem or threat in order to address it.