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TLS 1.3 also introduces something called 0-RTT: an optimization that's controversial because while it will be a significant performance gain in some cases it breaks what one would normally expect from a secure channel, namely replay protection for parts of the data. I would highly recommend (but it's not mandatory) that you read the following blog-post to understand the benefits and risks better: Introducing Zero Round Trip Time Resumption (0-RTT).

Recommended reading (from August 2018): A Detailed Look at RFC 8446 (a.k.a. TLS 1.3)

Certificate Authorities

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Further Reading (Optional)