One of, if not the most, iconic Bonsai species. A slow grower with many unique needs, and nearly overwhelming amounts of information online.
Protect the root system from sustained freezing temperatures. Move trees into an unheated garage, shed, or cold frame.
Repot right as the buds begin to swell but before leaves unfurl. Comb out old soil and trim back circling roots.
Decandling is a pruning technique that leaves the new growth of needles (called candles) until they begin to split, then removing some amount of them. By default, leave about 1/3 of the candle behind. For young trees focused on growth, decandling should not be done, as it halts elongation and thickening.
Standard baseline rule: Water thoroughly when the topsoil looks slightly dry. Never let the rootball dry out completely.