How many covenants has God established with humanity and are any of them everlasting?

I found this interesting partial quote from today’s Morning & Evening devotional by Charles Spurgeon. It’s about the “Covenant of Grace”: >Jesus is the representative head of His people. In Adam every heir of flesh and blood has a personal interest, because he is the covenant head and representative of the race when considered under the law of works; so under the law of grace, every redeemed soul is one with the Lord from heaven, since He is the Second Adam, the Sponsor and Substitute of the elect in the new covenant of love. Then I found this interesting snippet which, speaking of the pre-incarnate Jesus Christ, the Mediator, suggests that from eternity the covenant settlements of grace were decreed, ratified, and made sure forever. My curiosity has been piqued. Is the expression “covenant of grace” about the Abrahamic covenant established by God? Or is it about the “New Covenant” introduced by Jesus? Is this “an everlasting covenant”? I invite answers from Protestants on this topic, mainly because Spurgeon was a Baptist minister. I would appreciate a short overview (links to articles would suffice) of all the covenants established by God and whether any of them are everlasting. Edit: As suggested, this question is about Covenant Theology