PayPal checkout: How to get Paypal client id and client secret?

I don't know what my "Client Secret" is for PayPal. Is it asking for the password to my PayPal account?

No it is not your PayPal account password. You need to grab your PayPal account client ID and client secret. 

You may like to take a look at the following guide on how  to find your client id and client secret:  https://help.csod.com/help/csod_0/Content/Edge/Integration_Center/PayPal_Payment_Gateway/Obtain_Client_ID_and_Client_Secret_from_PayPal.htm 

Hope this helps.

Do try it our and get back to us if you have any questions.