Yes, Galaxy A50 has an in-display fingerprint sensor.
Yes, Samsung Galaxy A50 does have a 3.5 mm headphone jack.
No. Galaxy A50 has 2 dedicated 4G sim card slots and a dedicated MicroSD card slot. So, you can use 2 sim cards and a MicroSD card at the same time.
Galaxy A50 has a screen-to-body ratio of 91.6%.
Yes, Galaxy A50 does have the NFC support.