Weddings are paid work, and the people paying expect great images so if you're serious you'll need great glass. Popular lenses for wedding work are the 24-70 f2.8 L, 16-35 f2.8 L 70-200 f2.8 L IS & the 100-400 L IS. There are a few primes that are popular too but most are L series so do the homework, make the investment & claim the costs as necessary expenses on your taxes.
The 50/1.8 is the cheapest way to get sharp images but may not be good for group pics indoors. But if you get paid to do weddings then better get a high-quality zoom because you need the flexibility in order not to lose the decisive moments and not lose your concentration by trying to zoom with your feet.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
04/20/2023: New firmware version 1.4.1 is available for EOS R3
03/30/2023: New firmware updates are available.
2/07/2023: New product announcements!EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM