You can view back my previous related article about atom first use review.

Configuration needed to make Atom feel better

• Settings > show invisible (checked) : make whitespace show as ·
• Plugins > tabs-to-spaces : convert leading tabs to spaces or spaces to tabs
• Plugins > line-ending-converter : convert line endings(EOL) to Windows/Unix/Old Mac, and show current line ending in status bar

Useful hotkey

The full hotkey list is at File > Settings > Keybindings, below are some nice feature which other IDE sometimes lack off but is useful

• ctrl + d : find and replace (while remain selection of previous found word)
• ctrl + / : toggle comment according to file extension, IMO the commenting style is way better than eclipse
• shift + tab : remove 1 tab in selected lines
• ctrl + shift + \ : reveal active file in tree view
• ctrl k + ctrl u : text upper case

Useful shortcut

• right click + filename on pane > Reveal in Tree View: show the file location in tree view
• right click + file in tree view > duplicate : duplicate the file and change to desired path
• right click + md file > markdown preview: preview markdown in atom