What do i use for different size cracks contained by my foundation? i'm not sure what i should use for my foundation cracks. ...

i'm not sure what i should use for my foundation cracks. i've heard cement, epoxy, etc..very well i have a few small cracks surrounded by my garage the entire length of the foundation and then surrounded by the older chunk of my house i have cement blocks near mortar that has come loose or fall out completely. what should i use for these cracks? if i need epoxy can i find that at home depot?
Sewer gas - We've have two plumbers out...
Answers:    yep, if you are newly going to seal them use a flexible caulk, approaching butel rubber, or silicone,