Everyone who wants to see the world should check out
https://www.secretflying.com/ regularly. There are often really good deals to really unusual places there. The great thing about out of the way places is they make great bragging rights "oh, did I ever tell you when I was in Burkina Faso?"
If you are lucky enough to live in God's chosen country, Europe, Ryanair are almost always the best way to fly. The site is excellent and makes it easy to choose the cheapest date to travel. Never pay for a seat unless you have long legs. Based on my experience Ryanair actually have better leg room than Bus Eireann, the Irish semi-state bus company. They are often cheaper.
They actually have very generous free baggage allowances. You can almost always get a small backpack through without scrutiny. The limits are 40x20x25cm, and when your bag exceeds this they'll ask you to put it into one of these at the airport.
You can buy cheap bags at the exact limit online, I recommend them.
You can fit a weeks worth of supplies into the cabin bag slot, if you try.
You won't sneak by with a much bigger bag. I have seen European backpacker hippy sorts try to squeeze their bags, about 3x the size of the free allowance, into the free slot, fail, then roll their eyes rudely at the staff at the counter when they're asked to pay the punitive rate for checking a bag at the last minute (it's something like €70, not the end of the world).
Don't be rude to the staff. That's shit behaviour.
Also remember, online check-in (I have no idea what check in even is for) ends 2 hours before your flight departs. That's a long time. If you don't have free online check-in you'll be charged their punitive rate (about €70 or so). I got stung for this once.
Also airports in Europe accept mobile phone boarding cards. Airports in Morocco require physical ones, but don't worry, Ryanair will write you one and won't charge extra for it.
You can generally take whatever you want on the plane once it's in a plastic shopping bag. I learned this from a Mormon who tried to recruit me on a flight to Cincinnati one time. Security staff don't care and the staff at the gate assume it's duty free/don't care.
Also getting duty free whiskey at the airport shops and getting loaded on the plane might not be the best idea, particularly when you wake up the next day covered in vomit with an empty wallet and vague recollections of apologising to people at the airport and handing them money to clean up the mess. That's not cheap flight specific though.