Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2-fluoroethanol is:

Usually, the Anti conformation is the most stable for 1,2-disubstituted ethanes due to minimum steric and electronic repulsion.However, in 2-fluoroethanol ($\text{F}-{\text{CH}}_2-{\text{CH}}_2-\text{OH}$), the Gauche conformation is stabilized by intramolecular hydrogen bonding between the Oxygen-hydrogen and the highly electronegative Fluorine atom.Stability order: Eclipse < Anti < Gauche.