Previously when coding with Atom, there is a thing really irritating - when I code for php I have to set tab length 4 but for python or jade, I need tab length of 2.
Normally we set the tab length at File > Settings.
You can view back my previous related article about atom first use review.
It comes with lots of nice packages as default. For example PHP, git source control and etc. It also comes with spell checking, word autocomplete for writing normal blog post. It has increase my productivity when writing small project or blog post.