I've been "playing" ethernauts, a game by openZeppelin that teaches how to hack smart contracts (in order to teach how to prevent hacks). I'm through level 9 and really like the first few, but it's clear it was written when erc20 was new. Every level so far has required sending raw Ether transactions, which doesn't seem really common nowadays. Also it has attack vectors that are not possible now as the evem has matured (overflow/underflow, self-destruct, etc).  Still fun and something I plan to complete

I've been "playing" ethernauts, a game by openZeppelin that teaches how to hack smart contracts (in order to teach how to prevent hacks). I'm through level 9 and really like the first few, but it's clear it was written when erc20 was new. Every level so far has required sending raw Ether transactions, which doesn't seem really common nowadays. Also it has attack vectors that are not possible now as the evem has matured (overflow/underflow, self-destruct, etc).  Still fun and something I plan to complete 

https://ethernaut.openzeppelin.com/