A basic guide to security. [*updated*]

Computer security is something not so complicated, today i'll write down some tips for both computer and internet security.
First I'll start with the simple tips that some of you already know.

One basic method to protect your computer when you're not alone is by locking the screen, whatever OS you have, windows, linux, bsd your desktop environment or window manager will already have an option to lock the screen. You'll be surprised if you knew how many private data and passwords leaked because of that. Yes passwords too, all web browsers have the option to reveal saved passwords doh!

Set a strong password for your username, you can go as far as setting a BIOS password, of course you can reset it easily by removing the motherboard's battery in case you forget it

configuring UFW firewall.

Having a firewall on your linux machine isn't necessary if you don't use it as a server... but if you want to have a better control on your machine we'll see some basic configurations you can do.

First of all you have to think what ports you need to be open. Here's a good example

ports: 25, 53, 110, 443, 53323 on TCP must be open so you can connect to your e-mail, http, https and skype