Security question: Example with private key


I'm taking a look about and i can see the following: When choose "Private key" on , i just have to write a private key to see corresponding ETH and open a transaction form. Two questions about ethereum protocol (or mechanisms ?):

1. I can open any wallet and read how many ETH in it with a hex 64 characters string ? No need more "security" ?
2. To make the transaction, what it will needed ? I think i am missing something ^^

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