Freewill is the extent of choice we have over our life and its outcomes.
There are three ways of looking at fate.
It is all determined
Some scientists say that it is all genetic, we have no freewill, which is to say we are like robots with preconditioned software, thus we have no choice over what we do.
Some religions offer the outlook that we are the play things of a “God” or gods, we exist for their amusement, we must worship them, obey them, and we get punished if we fail their needs in any manner. The “God” or gods know all that is about to happen, and if we suffer as a result of events in life it is the “gods will” for which we should not question.
Thirdly, there are those who think that the movements of stars and planets determine our fate, so those that believe this consult astrological charts.
The Greek view
Though we are the play things of the gods we are free agents to decide if we wish to play along. Both gods and men are subject to fate, which is addressed in Homers Iliad about the Trojan war. In the Iliad the war is in stalemate until Hector kills Patroclus, an action that activates fate for which even the gods dare not interfere, a chain reaction that will lead to the doom of Hector, Achilles and Troy. In the Greek view we are free agents until we make a choice, then fate kicks in which determines the outcome.
The Viking view
The Vikings call fate Wyrd. Every object has three weavers known as the Norns who are weaving out the destiny of the object. The Wyrd mixes free will with determinism. The Norns spin from the natural law of the Cosmos, which Heraclitus would call the Common, three threads as follows:
That which has happened
All our past moments determine our present and future moments. Past cannot be changed once it has happened, but remains a force to determine our fate, thus it is 100% deterministic.
That which should happen
Our design, our nature, our DNA determines our fate. Things like intelligence and sexual identity determines how we act in a given situation. This thread is 100% deterministic.
That which is happening
This is impacted by a combination of strife (everything is moving according to its own agency collides with other objects causing strife), and choice (freewill to navigate the strife of life). This is 100% freewill, but with a Greek warning that our choices will determine in conjunction with the two other Wyrd threads our fate.
This is a thread where the doomed warrior with courage can defy the odds and survive. An example could be the plane crash in Libya in 2010, everyone but one boy survived. The plane and passengers were doomed by fate, and the boy should have been doomed, but against the odds his fate protected him.