The SRD is intended to be used by designers for , and . The D&D Beyond are intended for all players and contain all content in the SRD: This section contains the Dungeons & Dragons Basic Rules and the rules in the SRD, released as part of the Open Gaming License. You can see here that the basic rules includes all and , and even .
more backgrounds: only one in the SRD, about a dozen in the books more monsters: most big-name monsters are in the SRD, including some of the D&D signature monsters like dragons and giants, and references to other interesting ones like the beholder, though there are no description of the latter more items: the SRD even contains end-game items
In the d20 SRD's case, they left out the character creation rules and level progression table so as to hopefully force you to buy a book. However, for other games, being able to figure out everything is sometimes the point! For these though, it's more a matter of: why would you release a whole game for free!? (I'll talk more about that later.)
I know that the SRD rules aren't 100% identical to the official rules, but the difference is mostly missing subclasses and races. Are there any rules in the SRD which would actually contradict the published D&D 5E rules and make it difficult to play if some players used SRD rules and others used published 5E rules?
How compatible are the published D&D 5e rules with the rules in the SRD?
Does the SRD of Dungeons and Dragons 5th edition now allow the use of some iconic monsters like Beholders and Illithids (Mind Flayer), since the SRD is now under CC license? Or they are still prote...