If you keep them in cups or small pots then you can still put them outdoors for more optimal growth, but they will need more shade as full-sun can be too brutal on smaller plants / less established root structures. Keeping them indoors works too. I'm doing that for many. Hell, I've kept plants in those red beer-pong cups for well over an entire year indoors without issue. Last season I planted in a raised bed what was probably a 1.5 yr old Aji Limon in a red solo cup and it ended up being my most productive plant despite being totally stunted in growth for a year.