Back a long time ago when I had no money I used to have a TV and surround sound system from Radio Rentals. Think I had a washing machine too.
Nowadays I have nowt on tick, except for a mortgage. Cars I usually trade in, and pay the rest out of savings.
I've nothing against using credit cards to buy stuff, you get better protection anyway. I always pay off in full, so there's no interest charged, and you defer paying for things by a month.
If buying sofa/bed and there's a 0% offer, I'd probably use it and just pay it off before any interest applies. As long as you don't spend yourself into debt, it's the smart thing to do, leave your money earning interest if they will offer you a year or more without paying.