I recommend “RailsCasts” which explains Ruby on Rails tips clearly with videos and code, so I’ll introduce it.

・Official: Ruby on Rails Screencasts - RailsCasts

・Reference: Ruby on Railsを覚えつつ英語の勉強「RailsCasts」 - MOONGIFT|オープンソース・ソフトウェア紹介を軸としたITエンジニア、Webデザイナー向けブログ (Learning Ruby on Rails While Studying English “RailsCasts” - MOONGIFT | Blog for IT Engineers and Web Designers Focused on Open Source Software Introduction)

The procedures are explained carefully in videos, so it’s quite helpful. It’s also great that you can study English while you’re at it.

That’s all from the Gemba.