Is it safe to use Trezor with a third-party wallet?

Yes, it’s safe to use your Trezor with other wallets, since all third-party vendors use our API - Trezor Connect

Trezor Connect ensures the third party app is only able to perform protected actions by passing them to your device for physical confirmation and therefore cannot access or reveal your private keys.

You will find a full list of our supported third-party apps here: Apps - Trezor Wiki

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Hello I connected empty wallet to third party wallet and sent funds is it risky or not?Should I send always eth first?Secondly when using third party wallets should I always updaye firmware?What should I do additionally in order not to loose access to my funds in third part wallet?

Yes, as mentioned above: It’s safe to use your Trezor with other wallets, since all third-party vendors use our API - Trezor Connect

Simply put, on your Trezor device is stored only your private key (your recovery seed in other words) which never leaves the device.

Using the latest firmware is highly recommended.

Do not compromise your recovery seed. Learn about phishing attacks, and follow
Security best practices.