Southgate said: “We spoke to the forwards to remind them what a threat they are.
“The three of them were outstanding and caused all sorts of problems all night. They were a tremendous threat.
“Then it was for the rest of the team to provide and be brave enough to play. I thought at times we did that really well.
“For a young team I thought they put in an incredibly mature performance.”
Kane said England had gone into the game with a positive attitude.
“We knew we could beat them. We played well at Wembley (when Spain won 2-1) and came out of the blocks firing. I thought we defended well and soaked up the pressure.”
Sterling was pleased to have finally ended his long international scoring drought.
He said: “It was a beautiful feeling. I put a lot of pressure on myself to get into the box and try to score goals.
“Sometimes it works for you, sometimes it doesn’t, but I’m in the position to score goals and I need to keep that going.”