Zone focusing and "sunny 16" are the bywords for street shooting.
Ah
very rarely use my DSLR in the street, preferring wee rangefinders or a compact. Street candids are about capturing the moment not looking at rear LCD screens etc. If yer looking down at the camera, yer probably missing the $ shot. Trust yer judgement. Ye'll soon learn tae wait 'til the guy supplies the food (mebbe with a grin) and catch that, or the women come together and catch that - sharing out the takeaways or walking off with them together or whatever other opportunities avail.