(setq inhibit-startup-screen t) will disable the startup screen entirely so it always goes to the scratch buffer. C-h b shows all the key bindings, and C-h f

(setq inhibit-startup-screen t) will disable the startup screen entirely so it always goes to the scratch buffer. C-h b shows all the key bindings, and C-h f will describe any command (and give access to the source where it was defined).