If I printed out my boarding pass online and have no baggage to check, can I go straight to security at an airport for a domestic flight?

I'm flying United Airlines out of Newark International Airport tomorrow. I only have one carry-on bag and a purse so I don't need to check any luggage. I printed my boarding pass online today, so I'm assuming all I have to do is find my terminal and go straight through security? Is this correct? I haven't flown in years, and I'm flying by myself tomorrow so I'm a little nervous to navigate the airport. Thanks everyone!

Added (1). Also this is a silly question, but can I bring granola bars onto the plane to snack on if they're closed/sealed?

Do I need a transit visa for Qatar?

On my flight I will arrive at Hamad Airport in Qatar. My laover is 1 hour and 20 min. Will I need a transit visa? I read on wikipedia that only travellers travelling on Qatar Airways, with layovers between 5 and 96 hours are eligible. My laover is 1 hour and 20 min. On my returning flight i have a 7 hour layover at the same airport. Do i need to obtain a transit visa for my departing flight?

Added (1). @tellitlikeitis yeah, but here is a new update on 26 september 2016 and it says: 'On 26 September 2016, the Ministry of the Interior announced the issuance of free transit visas for passengers of any nationality transiting through Hamad International Airport. Only travellers travelling on Qatar Airways, with layovers between 5 and 96 hours are eligible'

Added (2). my country is eligible for visa waiver upon arrival valid for 30 days.

Maximum Argan Oil and Olive Oil allowed in Checked Luggage?

I'm planning to have 1L bottle of Argan Oil + 1L bottle of Olive Oil in my Checked Luggage.

I'm Flying with TAP Portugal from Casablanca Airport (Morocco) to Europe.

Is the amount I'm taking with me considered too much? Will it be subject to any extra fee?

Can a minor (15-16) fly alone?

I've seen a lot of users here claim that minors can't fly without an adult, or that they need to be escorted, but I'm pretty sure I took a flight alone last year, when I was 15, and bought my own ticket (with my real birthdate) and didn't need to be escorted or anything. Only minors 14 and younger need to be escorted on most airlines. I'm pretty sure a 15-17 year old can fly just like an adult.

Was I just dreaming or hallucinating about flying alone, and dreaming or hallucinating of all the airline websites I read?

Added (1). http://help.jetblue.com/SRVS/CGI-BIN/webcgi.exe?New,Kb=askBlue,case=obj(675)

Looks like a 5 year old can fly alone, let alone a 15 year old. And minors 14+ don't even need to be escorted anymore. So where do people here get their ideas?

Am I entitled to a refund for a medical emergency?

I purchased tickets from Condor airlines (via CheapOair) last spring for a trip to Italy. The day before our departure date, I was taken to the emergency room with a bleeding ulcer (a condition I had never experienced before). While I was in intensive care unit, my wife called Condor to cancel our plane reservations for the next day. Condor then charged us a $400 cancellation fee. When a refund never arrived, I contacted them and I was told we would receive no refund.