Beware of the complicators. It may be there is money in complicating things--a living even. There is fame, too. Then there is the work of the Devil, confusing people.
A centipede was happy quite, until a frog in fun,
Said "Pray, which leg comes after which?"
This raised her mind to such a pitch, she lay distracted in a ditch,
Considering how to run.
In the matter of salvation, where we begin our walk, it is very simple.
But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: John 1:12
The Gospel of John is so simple, yet so profound. Many missionaries begin with it, when introducing the Gospel message. If you don't have time, or are just plain worn out, read the first ten chapters. You will be well informed.
Beyond salvation, you may read 1st Corinthians 15:3 and 4. It is called the Gospel in a nutshell.
Wasn't that simple?