The positive battery cable(red) goes to either one of the larger posts on starter relay, but this post WILL have other wires added, its the 12v power distribution post for the whole vehicle
The other larger post will have just ONE cable on it the one that goes to starter motor, black one
Then there will be a smaller Red/light blue stripe wire, it goes to smaller post marked "S", "I" post is not used if it has one
Any other wires, will go to Battery cable post, one will be from alternator, others will be fusible links feeding other circuits and one wire to Engine fuse box if its not already hooked to battery positive by another cable