I always love giving new Reinhardt players tips, but do not play him right now. He’s so bugged that you’re going to hate how inconsistent and slow he feels right now. There’s numerous posts about it.
If you want to pick him up, at least take a moment to look at the links I provided on my post so you know what bugs are occurring on him.
The tips I usually give aren’t even working right now due to the animation delays and the inability to cancel animations with the latest patch.