How do I see how my posts did?

Each published post shows its likes, comments and shares as the network counts them, checked every few hours for its first 30 days. Beside them you see what people said to it in the inbox, how many replies you sent, and how many are still waiting.

Posts, then Performance, adds up the last 30 days: totals, each channel, the posts that drew the most, and the hours your posts do best once you have a few posts at the same hour.

A post's link gets tracking tags when it goes out (utm_source for the network, utm_medium=social and utm_campaign for the brand), so your website's analytics can tell where visits came from. Turn it off for a brand under Posts, then Settings.