Beginner - Best way to build a level for a platform game

Hi total noob here.

What’s the best way to create a BIG level for a platform game? I want to place a lot of the same ground/wall/trap objects and scale some of them down or up so I don’t have to create a lot of different objects.

Do I place them in scene view and duplicate them hundreds of times to build my level or do I instantiate them by a script? What is easiest and best performance wise?

Considering Unity automatically culls objects/tiles not being used I would just place everything you need. If this starts getting too rediculious and slows down FPS then divide the game into scenes. Tilemaps are great for the art and prefabs are the way to go for the more interactive stuff.