Pretty much what /u/BrunoAugustoMkt said:
For more detail, though:
Google – you ca do a variety in their digital workshop, where you can get accredited for all their suite (GoogleAds, Analytics, YouTube). Beginner and Advanced, all free.
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Facebook – they offer, again, a variety, such as their Blueprint Course, and Professional Buyer Course ($150) to name a couple.
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Google stuff is usually basic – i.e having it usually wont ‘seperate you from the crowd’ if you’re going for beyond junior positions, but not having it will raise eyebrows.
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Outside these most of the great ones I ahve found are higher prices (like some Jon Loomer ones – he has a great Pixel Masterclass).
Digital Marketer has a lot of beginner stuff, too, and i think you can get some certificates via them.
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These courses, however, arent the only way to learn, things like Measure School, Loves Data, Ben heath and other digital marketing creators do very useful tutorials are beginners.
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Good luck, lmk if you have any Qs