You fix grip strip around the room perimeter with a high grab adhesive from a applicator gun. Lay underfelt/padding then attach the carpet to the grip strip. Pu underfelt is the best.

I have concrete floor and recently got new fitted carpets, the carpet fitter put down smooth edge which grips the carpet to the floor

you will need tack strips for concrete. and a good carpet pad

Thank you both Jackie M, & Jim, your suggestions will help A LOT :)