Restlessness is the mind that will not settle: jumping between tasks, replaying worries, reaching for the phone, and finding quiet uncomfortable. Nearly everyone knows it, and it often makes people feel they are failing at focus or calm. Yet a wandering mind is ordinary human experience, and the first step is simply to see it without harsh judgment.
The Gita says as much. In Gita 6.34 Arjuna admits the mind is restless, turbulent, powerful and stubborn, as hard to control as the wind. Krishna agrees in Gita 6.35 that it is difficult, then adds that practice (abhyasa) and detachment (vairagya) can master it. Gita 6.26 advises bringing the mind back every time it strays, and Gita 6.25 recommends doing so gradually, with a steady intellect.
Put this to work with small habits. Set a quiet time and place, as Gita 6.10 suggests, and simplify what distracts you. When attention wanders, return without frustration, since each return strengthens focus. Gita 6.19 offers the picture of a lamp in a windless place, a calm and unwavering flame. If restlessness feels constant or distressing, please also speak with a doctor, counsellor or trusted person.