How to create a visible frame?

[Normy]

Hi,

I just started playing around with addon making and i've learned how to set up my files and make simple commands like showing a message and creating slash commands.

I have been looking alot on how to create frames and i can't relly get my head around it.

What i want to create is a small little frame that pops up when i type a slash command or just when the addon is loaded. Maby a little text in it and a close button.

Thx for any help!