The right path is the path that will lead a person to the destination which he is intending to go. Every path leads somewhere. The destination which someone wants to go determines which route he will take. If you take a path that you don't know its destination, that means that you don't know where you are actually going.
Our destination according to the Bible is heaven. So, if we are looking for the right path, it must be the path leading to heaven. Our destination is heaven, the path leading to heaven will be the right path. Other paths are the wrong paths.
The right path according to the Bible is the path of God’s commandments. God gave the Israelites the commandments to follow. He has them to obey his commandments for as long as they do that they were accepted of Him. When Jesus Christ came, He came with the doctrines from God to establish the kingdom of God. He established the church and offered us the doctrines to which are to lead us to heaven.