Unlike Photoshop, Illustrator won’t allow you to have a preview of the fonts on the Character Panel (Windows users only). For a preview of your fonts go to Type -> Font, or, with the selection tool or type tool, select your text, right click and choose Font. Make sure Font Preview in enable by going to Preferences -> Type . There you can also set the preview size.

If you are working on a document that has several art boards, and you  need to create single documents from each one of them , here’s what you’ll have to do.  

There are two nudges in Illustrator. Normal nudge: done by pressing an arrow key. Super nudge: done by pressing shift+arrow key. The super nudge is 10X a normal nudge.

A quick way to change the measurement units in an Illustrator or Photoshop document is by right clicking (on pc) or ctrl+click (on mac) on a ruler (ctrl+r / cmd+r) and then choose a different unit .  

While drawing a shape try these key shortcuts: Space bar: Allows you to reposition the object while creating it.

Draw a circle and apply the Zig Zag effect with the setting as shown and you will get a badge shape.

Draw a rectangle shape, go to Effects > Stylize > Round Corners and enter a radius value.