Enough lifeboats for the entire passenger and crew list first and foremost – rules about that came around directly because of the Titanic disaster. The ship sank very slowly and there was more than enough time to evacuate everyone, there simply weren’t enough boats.
Now for boat construction itself, the main change is watertight chambers that seal at the top too – Titanic’s didn’t and they spilled over as the ship listed.
More generally, radar and guidance systems so you don’t smack an iceberg in the first place.
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