What's the best way to get rid of ants inside my home?
Some options to consider:


ant poison (Terro a being a popular choice) 
fill in the crack (concrete crack filler)
get a pet anteater (not sure how easy they are to house train)


Once the ants are gone, you can then get perimeter ant poison for your big-box DIY retailer. It's a granule that you can spread around the perimeter of your house to help prevent them from migrating into the house. Diatomaceous earth is also a good choice as a perimeter barrier (it's basically a sand that is microscopically 'sharp' for insects and they are reluctant to cross it).