I have been using a Samsung A5 (2017, SM-A520F). Its maximum performance in video recording is 1080p, 30 FPS.
Please specify the minimum practical write speed that I need to have when I am buying a new memory card?
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I ran some data rate calculations based on 1080p30, 8 bits per color, no chroma sub-sampling, high motion, and H.264 AVC compression, and came to the conclusion that 8 MegaBytes/sec should be plenty.
This accords with the Secure Digital Speed Class Rating table that @Attie linked to. Since SD has no 8 MegaBytes/sec class, the 10 MegaBytes/sec class (C10/V10) is recommended for "Full HD" 1080p30.
So I agree with those industry association recommendations. At a practical minimum, you want the V10 class that supports 10 MegaBytes/sec sustained/sequential writes.