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This depends on what your balcony is like, convex, the balcony can actually create a good private space, put tatami mats or sofas, hardcover curtains, + partition curtains can create another private space for solitude.
Large sunscreen curtains should have good permeability.
It depends on your actual situation, generally the balcony is a waterproof blackout roller blind, if you want to use a curtain it doesn't matter, just remember to close the window when you go out.
It depends on what you like, I think as long as you like the style.
It can be made as a gauze curtain, which is very atmospheric and does not block the light. Because strong light irradiation is easy to age, and the cost is lower than that of cloth curtains.
It is recommended to use fir solid wood boards, the texture of fir boards is relatively soft, you can try it.