This has some block code, but it’s pretty easy if you follow the guide.
Everything that isn't block code
Place a button, when pressed, trasmit on “Check fish”.
Next, place a popup. Make it open on “Check fish”, and make block code happen on “Check fish”
Then, follow this guide until you reach the overlay part:
How to make a stylish cash counter (Difficulty: 
)
So, now you have a property that tracks an item.
The block code. (Repetitive)
In the popup you made in step one, (Block code area), make set-up like this:
Now, this shows the amount of {item} you have! Duplicate this code but with different propertys for it to track more!
This is the finished product:
