This parsha and the first aliyah begins with a big promise: that if the Jewish people keep all the mitzvahs, we will be blessed in all good ways and have no sickness or other troubles (see the Chumash for specifics). Also, we will easily consume the nations that currently occupy the land of Israel and that G-d will even send a hornet ahead of us to attack our enemies for us.
This aliyah then gives some details of the forty-year trip the Jews have just taken. Their clothes stayed new and clean and grew with them so they were always the correct size.
The end of the aliyah gives details of the wonderful features of the land they are going to and says, "When you have eaten and are satisfied, you shall bless G-d." This is the commandment of the blessing after a meal (also known as "birchat hamazon" in Hebrew or "benching" in Yiddish) and is almost the only blessing that is specified in the Torah. The rest of the blessings we say (with the possible exception of the blessing before speaking words of Torah) are of rabbinical origin.