I'm building a person following shopping cart with Arduino for my final year project. The cart is supposed to be able to follow its user while shopping use of Bluetooth module or wifi module will be feasible or not?or I should use IR sensors ?
Bluetooth beacon. Use "bluetooth positioning arduino" as search terms.
Bluetooth beacon is a way to achieve the same as a GPS can do outdoor. By placing beacons around the room you can find your position in 3D space.
So a beacon locator on the shopping cart (Arduino with BLE module or a ESP32) and one on you (mobile phone) and then some central unit that can coordinate the two positions.
Just as a concept it would be feasible.