Can I travel to my country if i got my green card through SIJS?

You should consult with a local immigration attorney before leaving

What happens next after filing K1 visa? Need to leave the US even no residence in home country for years?

You should really consult with an immigration attorney as soon as possible. You want to make sure she's not an overstay or have any bars on her

I came for visit but I like to further my education in US because the course is not offered in my country.

You should go to the school were they are offering the course and ask them to switch your visa if possible. Good luck

After I submit I-130 how long is priority date & visa approval for f2a if my daughter get aged-out will CSPA apply & guaranteed?

You can review the visa board in the uscis website. Another way is since your I130 was approved your case should be at the NVC. You can call them...

Can my travels overseas affect my naturalization process?

Yes you can do as you planned. Keep in mind that you should not stay out to long. B. Your almost there get you citizenship then you can do what...

What can i do if my wife visa has "Cancel without Prejudice"?

Your situation is a little to complex to be answered on this forum. Please consult with a local immigration attorney

Is a round ticket required for an immigrant to the U.S planning to stay permenantly?

Your question sir is to vague. What type of visa is she coming on??

Can I renew my green card from 30 years ago

Yes you can renew your green card I highly recommend you contact an attorney to assist you with this

Is citizenship certificate for a child will last when they turned 19?

She will become a citizen forever but I'm sorry you did not mention her legal status. Because that depends on that to

I'm sorry your case seems to be to complex to answer on this forum. We cannot no what your situation is just by a vague statement. Please consult...