Wet basements have a small number of root causes: ground that slopes toward the house instead of away, a blocked or missing foundation drain, downspouts that dump water at the wall, and cracked foundation walls. In most homes it's more than one at the same time.
Start with the easy fixes. Are the downspouts discharging at least 6 feet from the foundation, sloped away? Half the wet basements in Eastern Ontario would be dry if this one thing was corrected.
Next, look at the grade in the first 10 feet around the house. It should slope away from the foundation at a minimum of 6 inches over that first 10 feet. If water pools within a few feet of the wall after a rain, the grade needs to be fixed before anything else is worth trying.
If those are correct and you still have water, the foundation drain around the footings is the next thing to check. Modern homes have 4-inch perforated pipe wrapped in a filter sleeve and surrounded by clean stone, draining downhill on its own or into a sump pit. Older homes often have clay pipe that has collapsed, plugged with silt, or was never connected to an outlet in the first place.
A drainage contractor should walk your site during or right after a rain, look for the actual pooling and entry points, and design a fix that addresses the root cause — not just install a sump pump and hope.