in the case of a desktop with the right setup you can do the same as with the mobile, including zapping,

it is a fun kearning curve, take your time.

how?

you install a signer as an extension in your browser, you can use iris.to as a client and sign with nos2x Nostr extension and if on Brave you can use A.K.A Nostr, as a rule of thumb try not using your nsec to sign in directly, which is your private key, similar to your Bitcoin private key.

you add the nsec to the extension and you sign with the extension