Facts are empirically observable and testable. Discussions around facts require precise language. Tardy communications can crash airplanes!
Opinions are malleable. They are open to interpretation. They can be presented as facts if we are not careful, or if we are being deliberately unscrupulous.
Conscious awareness of when we are using one or the other is important.
Making key decisions based on opinions masquerading as facts can be dangerous. Throwing too much facts around during ideation can kill creativity.
Learning to differentiate between the two is useful too.
Is someone quoting facts or expressing an opinion?
Are they representing one as the other?
What is their intent?