Best way to avoid linking

[Loque]

Thanks to this community members I succesfully started my first BTC wallet. 
Now first questions are born. 
I'm using last Electrum version. I have doubts about addresses linking.
I have my btc address on my web site so my customers can pay me for services.
I want to avoid to keep tracked on my earnings.
Which is the most simple solution? To change address every day or for every transaction can be enough?
Or each wallet's address can be linked in the blockchain history data?

Also, if I use Electrum without Tor or VPN, the ISP can know every history of my wallet?
If so, the solution is to use my wallet in a Tails virtual machine where I use Electrum there?
Or there is a simpler solution.

Thanks for help 

[OmegaStarScream]

A combination of using a new address for each transaction and also using mixers (ChipMixer is a good option) should be sufficient for hiding your earnings from people.

I don't see the point of using Tails and Tor here but If you're for some reason super paranoid and careful then yes, using them could add a layer of privacy.

[Loque]

@OmegaStarScream thank you!

So addresses cannot be linked each, and cannot be linked to the wallet?
About Tails. I read on an article that Electrum does not send details to the server with an encrypted connection. So the ISP can record the history imo. Also standard wallets like Bitcoin core does not use by nature an encryption.