Yeah, so Joshua has been chosen by God to lead the Israelites and he's pretty stoked about it. So God tells him, "Hey, don't be scared, just keep my commandments and you'll be fine." But in case that wasn't enough to get him pumped, God also made sure to mention how he'd be successful if he kept the commandments, like, if he did, his enemies would be defeated. I know, it's like, c'mon God, give the guy a break! But, in the end, Joshua decides to take the challenge and he passes it on to the Israelites to be strong and courageous, like, no matter what. So, that's it, the beginning of Joshua's leadership over the Israelites.