As a JO, I bought cheap upholstered furniture and nice (more expensive) wood furniture. Held me in good stead. 40 years later (after moves in and out of the military), I still have almost all the wood furniture and upholstered furniture is long gone.
A few pieces of advice:
(1) Be careful about Facebook Market, eBay, etc. JO who recently bought something from Facebook said it was "gross." Be sure you see it in person and stay away from mattresses, upholstered furniture, etc. We bought a couple of nice wood pieces off eBay -- one was slightly damaged in transit.
(2) Be careful about IKEA. Their stuff is great for one location. It does NOT move / transport well. I bought several pieces over the years (desk, bookcases, etc.). Beautiful and useful at first. Not one survived a single move. Total loss every time.
(3) Don't be afraid to invest in some nice (wood) pieces, including antiques. I bought a brand new cherry curio cabinet in 1986. Looks great 6 major moves later. Ditto with an antique dresser -- still beautiful and in my bedroom. Wood furniture tends not to look as dated and hold up. If it gets damaged, it can typically be repaired easily. You can often find good pieces at Goodwill, Salvation Army, estate sales, etc.
(4) Get cheap(er) but new upholstered pieces. They don't hold up. They look dated more quickly.
(5) Invest in a decent mattress. It's what you sleep on. A good one should last at least 15 years.
(6) Consider whether you want to invest in an expensive TV. It may or may not transport well. We've typically left ours when we moved.
(7) Get cheap lamps and side tables and other accessory pieces. They tend to get broken in moves, look dated quickly, and are cheap to replace.
(8) Don't be afraid to invest in nice art -- stuff you like. That usually moves well and can quickly make your place feel "at home."