For God so loved the world, that he gave his one and only Son, that whoever believes in him should not perish, but have eternal life. For God didn’t send his Son into the world to judge the world, but that the world should be saved through him.
John 3:14 As Moses lifted up the serpent in the wilderness, even so must the Son of Man be lifted up,
John 3:15 that whoever believes in him should not perish, but have eternal life.
John 3:16 For God so loved the world, that he gave his one and only Son, that whoever believes in him should not perish, but have eternal life.
John 3:17 For God didn’t send his Son into the world to judge the world, but that the world should be saved through him.
John 3:18 He who believes in him is not judged. He who doesn’t believe has been judged already, because he has not believed in the name of the one and only Son of God.
John 3:19 This is the judgment, that the light has come into the world, and men loved the darkness rather than the light; for their works were evil.
The verse centers on "world", "saved", "loved", "gave", "only", "whoever", "believes", and "should". It is saying that the verse draws attention to "world" and "saved", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 15's "that whoever believes in him should not..." into verse 18's "He who believes in him is not...", so "world" and "saved" belong inside that flow. In Jesus Explains God's Saving Love, the local focus is new birth, eternal life, belief and unbelief, and God's saving love.
A plain takeaway is to answer the verse's own emphasis on "world" and "saved" with trust shaped by these words, not by a vague optimism outside the passage.