if you already know the basics of Solidity and want to take your skills to the next level + learn about solidity, this is incredible:

ethernaut.openzeppelin.com/

(probably not recommended for beginners tho)

if you have a basic JS/React knowledge, the best place I know to start with web3 dev is buildspace.so/
Super nice beginner-friendly projects
Good pace, not too hard. You will master the basics. The community is huge.
They give you a cool NFT if you finish the projects in a week.
They will help you find a good web3 job if you're good enough: that is their business model I think — they already partnered with lots of huge web3 companies. Check them out, totally worth it!!!