mayb this is the most silly question u ever heard
coz i wanna try to learn guitar
can a guitar connected to headphone if i dont wanna to connect it to amp??
coz i dun wanna make noise in my house
i really need to know it

Nope........ unless it's a powered headphone.
Cheapest solution? A small tiny amp with headphone out.....

Years ago my solution was to use a software modeller, so just use the pc output to listen to my playings, then I got a multieffects pedal so that I can plug into the pc input or straight to a headphone, but now you can get the amplug lahh.. so easy.

my way
guitar->multieffect-> headphones

Yea, you can get a pocketpod where you can use normal hp headset.
Or, u can buy a cable converter and play it using ur pc's speaker directly from ur guitar.

same here. direct headphones to amp connection lacks ambiance(duh, you're not using the amp speaker anymore).

I think this way is the easiest. Try it!!

Get a small 10 watt amp ... And plug in a headphone . And play