Done well, an outdoor space becomes the best room in the house for half the year. Done cheaply, it becomes a graveyard of faded plastic by the second summer. The difference, as with everything on this site, is buying fewer, better things.
Furniture first: weatherproof materials — powder-coated aluminium, teak, all-weather wicker over a real frame — last years and develop character rather than degrading. Buy a smaller set in good materials over a large set in poor ones; it is the capsule-wardrobe principle applied to the patio.
Lighting transforms an evening garden. Warm, low-level lighting — festoon strings, path lights, a few lanterns — turns a functional yard into somewhere you linger. It is inexpensive relative to its effect, echoing the lighting advice in our home-upgrades guide.
Planting is where restraint pays again: a structured, repeated palette reads as designed, while a scattergun of clashing colours reads as busy. Evergreen structure plus a few seasonal highlights gives you year-round form for less ongoing work.
For furniture, lighting and the practical bits, the outdoor range we link is a sensible starting point, with more general home and outdoor kit on the deals board. Spend on the frame and the materials; everything else you can layer in over seasons — the same approach behind a good capsule wardrobe.