■ GIMP Basics
By Sunblade < sunblade@tilde.club >

1. How to give border to a layer

Menu > Edit > Stroke Selection

2. How to add alpha channel to a layer

Menu > Layer > Transparency > Add Alpha Channel

3. How to improve text management

Tool Options > Enable Text Editor

With this option enabled you will be able for example, to refresh text formatting easier when changing a font.

4. How to use drop shadow

Menu > Filter > Light and Shadow > Drop Shadow...

It can be used in any layer (text or image)