God's goodness is His purpose in all things. "And we know that all things work together for good to those who love God, to those who are the called according to His purpose" (Romans 8:28). That does not mean bad things can never happen to you. It does mean that God can bring good out of all things, according to His purpose.
God's goodness is His creation. He made all things good in the beginning. It was man who sinned, and brought evil into the world. All the goodness we know and experience comes from God, because God is good. "For the LORD is good" (Psalm 100:5).
God's goodness is His salvation. "The goodness of God leads you to repentance" (Romans 2:4). When you discover how good God is, you change your mind about sin and evil. In salvation we repent, turning from our sin to God's goodness.
God's goodness is His blessing upon all who trust Him. "Oh, taste and see that the LORD is good; Blessed is the man who trusts in Him" (Psalm 34:8). LORD is God's covenant name. All who trust the LORD enter a covenant relationship with Him. They receive the blessing of covenant promises.
God's goodness is the Holy Spirit working in your life. As a believer in the Lord Jesus Christ, goodness lives in you. It is God's goodness through the Holy Spirit working in you. The fruit of the Spirit includes goodness (Galatians 5:22). You can say, "Oh, my goodness!" It's your goodness, only because God's Spirit has worked it in you. Give Him all the glory, because God is good.