Or maybe you have the same as this misconception about the merge:
https://cointelegraph.com/news/the-merge-top-5-misconceptions-about-the-anticipated-ethereum-upgradeMisconception 1: Ethereum gas fees will reduce after The Merge
Misconception 2: Ethereum transactions will be faster after The Merge
Misconception 3: The Merge will result in downtime of the Ethereum blockchain
Misconception 4: Investors will be able to withdraw staked ETH after The Merge
Misconception 5: Validators will not be able to withdraw ETH rewards til the Shanghai upgrade
Others have provided you a good link to start with. So it's better to read them first and understand everything. There are also a lot of threads here in this board. It's not that deep, as there are a lot of recent threads about the Merge.
Misconception 1 is that most people make the most mistakes, because most of them don't learn or read anything about the merge. They always think that the eth upgrade is short-lived and one-time only without knowing that the merge is just the first stepping stone for other upgrades to be updated in the future. The reduction in gas fees and the increase in scalability is only seen when the sharding upgrade is updated and the misconception of many people that upgrading will help increase the price of eth but things did not go as many people expected.