How do I make a chest and/or a computer-like thing that has storage and commands?

• Make a block and toggle the option "has inventory".
• Make a GUI. 
• Add inventory taken from block (and choose that block).
• Add all GUI' slots. 
• Edit the block with invetory. 
• Add an event whrn rightclicked->open GUI. 

The previous comment was for chest. For a computercraft-like thing you need to code (and also lots of code). For making a simple block that has some buttons, follow these steps:

• make a block (without inventory if you don't want to make that the computer has also the chest feature). 
• Make a GUI. 
• Add a button (like music button). 
• Add an event in that button (like play music); then add what it does (plays entity.cat.purr)
• You can add more buttons, but also buttons that open/close GUI. So you can make multiple guis per block
• Example for multiple GUI block:

(DefautHome: time home button -> open GUI: TimeHome)

(TimeHome: lots of buttons that change the time with the event: day button -> set time: 0; night button -> set time: 16000; etc.) 

Sorry for errors but I'm Italian

@#3 you can't make it without coding