I live by myself, in a house I own. So my 'situation' is different, of course. (Just like everyone else's, it seems.)
The local 'big box' hardware/lumber store has shelf units based on vertical runners attached to studs and shelf holders which hook in to the runners, forming the supports for horizontal shelves. The local 'Dollar' store (or what ever it's called in your area) usually has clear plastic storage boxes WITH tight covers (I live in a dusty area) which will fit on the shelves.
Recently I sorted a bunch of handgun grips/stocks by size and firearm model and put them in the boxes. Many of them are 'spares' and a couple are collectable and sort of collectable items. AND I can find them easily or take them to the gun show as desired.
Same idea for holsters (I have between five and 40,000 old holsters I don't use.) Scopes, rings for scopes, perhaps gun parts can be segregated the same way.
On the subject of storage; some of the larger plastic boxes with lids will work for my 'winter sweaters' and other seasonal clothing. It goes out of the way in dust proof boxes until I need them again. Same for 'summer' clothing.
I use a variation of Cooldill's idea. A 'sorting and storage' bin for small parts (electrical connectors or screws and nuts) with movable dividers kept all the 'change parts' for the Dillon progressive in my loading room. Also, a cheap set of rack mounted bins make sorting brass by head stamp or caliber or other smallish doodads much quicker and easier.
Most of my empty brass is in surplus ammo cans. Loaded 'practice' ammo is typically stored in small ammo cans (I'm not strong enough to use large ammo cans for bullets or loaded ammo). For some calibers (.22 centerfires mostly) I use medium ammo cans for empty brass and bullets, watching total weight.
There are a couple of blank walls in the basement with various hooks for gun belts, hearing protectors, and other 'stuff' which don't store in a box so well. I have one or two designated range boxes for equipment I take to the range regularly (Squib rods, generic screw driver, a small note book, stapler and staples, a 'Sharpie' for making notes on targets, duck tape (in case my duck breaks) and such).
Oh, if you have a CED Chronograph, spend the money and buy the carrier. Everything fits and it's ready to go all the time.