Do I need to verify every time I run it?

When I look at the digital signature list for the installation file I used I am seeing "Bitcoin Core Code Signing Association", is that normal? I have v0.21.0

You have the option of verifying or not verifying the signature

how to verify it, anyone can help me.

Hey guyz
could you suggest how to verify bitcoin core and what are the different methods to verify bitcoin core iam expecting yur reply

Only a stupid person would fail to verify before running the core software on their computer. At this day and age where hackers need just one silly mistake to clean ones stack of coins, it is paramount to be security concious before using downloadable softwares...before use, verifying using a command line prompt or other third party applications available is wise. 

Yes, it looks like there is a change of signing certificate and the guide on the first post hasn't been updated. If you want to make sure, just try the other verification options.

The same developers still manage it as before, you can see on the referred link above, the one who tells it is @achow101, which is one of the bitcoin contributors.

Just a side note, it may be registered as LLC due to the requirement for acquiring the certificate. I think it's better not to rely on the Windows code signing certificate, I don't know how verifiable it is to be able to verify or check the authenticity of the software itself. You better use the second option, which was using the PGPs method. The guide on how to do it is also available on the Bitcoin Core Website(https://bitcoincore.org/en/download/).