It is being treated as a new request.

Can I apply for naturalization from 4/1/2020 If I am legal residence from 7/1/2015 ( Green Card Holder)?

Yes, you can apply 90 days prior according to the regulations.

A friend of mine has a hearing before a judge scheduled but cannot be present. Can he hire an attorney to go in his place?

You should definitely hire an attorney to start the process.

Does food stamp application and process affect someone's citizenship?

Public assistance does not prevent you from becoming a citizen.

Is it possible to apply for Re-Entry Permit?

You can apply for a reentry permit. However, don't be surprised if you get a hard time when you return. Definitely consult an attorney for your...

I assumed that he has an I-130 approved, which you did not mentioned.

What is the process to get a copy of a lost green card after I have completed my one-year judge assigned voluntary departure?

You do not have any status. If you have anyone that can petition for you here, such as you mother, she should hire an attorney and consult on your...

Can someone be denied a visitors visa to the U.S. because of what kind of job they have?

Visitors visas are discretionary. The person applying for the visa needs to proof that they will not come to the US to stay. Its not what she does...

Asylum for a person who previously was in Mexico, Spain and Netherlands?

Based on the facts you provided, it does not seems that you mother in law qualifies for asylum. However, you should consider consulting an attorney...

Get married with J1 visa

You should consider hiring an immigration attorney.