I need to know how to hack minecraft so i can have about 50+ diamonds. If you also know how to hack roblox please tell me immediately

Open Minecraft and start a new game or load a saved game.
Open Cheat Engine (Windows) or Game Conqueror (Linux).
Select process 'javaw.exe' near the bottom ('java' for Linux). (Please note: If you have downloaded the standalone, select 'Minecraft.exe' from the list instead.)
Get at least 3 of some block type in your quick slot.
Start a new search and search for that quantity.
Drop an item (Q).
Search for the new value.
Drop another (or pickup the old one, doesn't matter).
Search for the new value. You should only have a few now. Repeat until you only have ONE entry.
Double click to add entry.
If you wish to change the quantity of your items, simply double click the value in the bottom pane and change it to what you wish (not higher than 65000)
To change the item type, right click the new entry and choose 'Browse this memory region'.
Exactly 8 bytes to the right of the block's quantity is the block's type. Compare with the hex values found here.
To change the type, copy the decimal value from the data values page, double click on the type in the memory viewer, select 2 bytes, and paste. You can do this for items (e.g. Ingots) as well as blocks.

Oof!

VERY SIMPLE HACK HERE!
Step 1: Play the game(s)
Step 2: Get Diamonds/ Robux or whatever