Picking up weapons in platform game

I don’t have internet at home, so when I saw the new platform tutorial I realized I had to ask questions quickly ( I only have like 40 more minutes before I’m outta money).

If I add a few weapons and place them around the “map”, can he pick them up, and they be added to an inventory? Where he can press 1,2,3,4 or whatever the number slot the weapon is in… how would I achieve this? And how would I make it so each weapon had a different damage effect on the enemy?

I know I would have to make MCs of him with each weapon.