Has access to crowdsale contracts been removed? what's the best way for me to write a pre-sales, distribution and whitelist contract... if anyone can help me I'd really appreciate it... thanks !!
Hi, welcome to the community! 
Since version 3.0.0, this contract has been removed. Maybe you can check out the previous documentation: Crowdsales - OpenZeppelin Docs
And there is a tutorial for the crowdsale contract, you can have a look: Simple ERC20 Crowdsale | OpenZeppelin Community
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Hey @iamcarllosjr, welcome to the community!
Thanks for your quick response @Skyge, I’m adding a few extra things:
First, you can have some extra context in this thread.
Also, I think the best way of achieving what you’re looking for is to use a Merkle tree, which you can see in action in this workshop. Note that it’s appled to NFTs but the concepts are easily applicable to ERC20s.
Best to both!
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