This is bitcoin discussion, you can ask about ethereum in the Alts section.
Credit card is accepted at some of the exchanges directly but you can't buy bitcoins with paypal, because  sellers worried about disputes and claims, because Paypal always stands for the buyer's side in connection with crypto, so if the buyer receives the bitcoins after the payment and after starts a claim, paypal will refund the money and will charge the seller. In this case the seller won't have the bitcoins (because the transaction is irreversible) and also won't have the money, because of Paypal.