So if you just came from the home page you should know Black Widow has started a business for the US army. She is doing it so the military stays up to date with all of there weapons.The things her business will be producing will be things such as, knives, guns, and other equipment. She will pretty much create anything the US army asks for. She has mastered a bunch of weapons and equipment so she just decided to help out for free.
https://www.comicbookmovie.com/black_widow/marvel-legend-stan-lee-hints-that-a-black-widow-solo-movie-is-going-to-happen-a155221
https://www.nme.com/news/black-widow-set-photo-familiar-character-return-2553575