Operating System

Anti-virus

Browser

Brave browser

Secure, Fast & Private Web Browser with Adblocker | Brave Browser

Brave is a privacy focused web browser that blocks ads and even let's you earn crypto by popping their ads (not intrusive).

How-to: Recibir BAT con Brave (Spanish)

Plugins

Use original plugins

There have been numerous hacks where the attacker creates a fake plugin to steal your data (including seed, financial info, etc). Make sure that you know and trust the plugin that you're installing and that the plugin is the one that the developers have created.