I will not bog anyone down with science, all you realy nead
to know is that:-
1) Air is sucked in and compressed
2)Fuel is added
3) The air/fuel mix is ignited causeing a rapid expansoin of
the gases
4) Which are expeled through the engine outlet
Thus providing thrust and pushing the aircraft forward. Below
are some diagrams which explane most options you will come across in Jets45.