When you become an owner of coins or tokens, you need to store them. All your crypto assets are stored on the blockchain. It contains information about all crypto you have. Keep records of all transactions and amounts.
To access your funds, you need two keys. One key is public. It is like your bank account number. If you share this key, anybody can send you a coin or token.
The second key is private. This key should be kept securely. You use it to sign all your transactions and prove the ownership of your assets. Like a password to access your funds and make a transfer.
You can store these two keys in different ways. Write it down in the notepad. Store on a flash drive. Or use a crypto wallet application. It gives you access to your crypto assets. Allows you to make transactions and see your balances and history in one place.