There are several keyboard types on the market, but they all include the same basic parts:
To type a capital letter, hold Shift while pressing the key - e.g. Shift + a gives A. If Y and Z appear swapped, press Ctrl + Shift to switch the keyboard layout.
Feel the small bumps on the F and J keys - that is where your index fingers should rest. Without looking at the keyboard, you can always check whether your fingers are positioned correctly.