What boosters are good at
They can relay an existing wireless network into a room where the router signal is weaker. That can make everyday connections more usable if the device is placed within range of the router.
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Guide
A WiFi booster can help with a local weak-signal area when positioned well. It will not solve a slow broadband connection or poor signal at the extender itself.

They can relay an existing wireless network into a room where the router signal is weaker. That can make everyday connections more usable if the device is placed within range of the router.
A booster does not repair an internet outage, improve a congested broadband line or create a strong link from a place with no router signal. Diagnose the connection near the router first.
Some extenders use a separate network name, while others support roaming features. Check the device documentation and your client behaviour before assuming devices will switch seamlessly.
Set up near the router, then move the booster towards the weak area while keeping a dependable connection back to the router. Recheck the room after each move.
Common questions
A booster can be useful for extending coverage to a nearby weak area, provided it receives a good signal itself. It is not a cure for slow broadband.
They can relay WiFi to devices beyond the router’s best coverage. The outcome depends on placement, radio conditions and compatibility.
It may be worthwhile for a specific dead spot after checking router placement and service quality. Compare it with a wired access point or mesh if coverage needs are broader.
Repeating a wireless link can affect throughput and add another link in the path. The result varies by device, configuration and signal conditions.