The second death is simply another way to describe the lake of fire
Revelation 21 verse 8 says but the fearful and unbelieving and the abominable and murderers and whoremongers and sorcerers and idolaters and all liars
Shall have their part in the lake which burneth with fire and brimstone
Which is the second death now the reason the Bible describes it as the second death is to simply make a distinction between the current
Location of hell and its permanent relocation in the end of the world
According to the Bible both death and hell are cast into the lake of fire in Revelation 20 verse 14
The Bible teaches that the current location of health houses the souls of the dam until the Great White Throne
Judgment at which point God reunites the souls of the unsaved with their physical bodies and both soul and body are cast into the lake
Of fire according to Matthew chapter 10 verse 28 now the way you can avoid all this is by simply getting born again
Which means to be saved the Bible says in Revelation 2 verse 11?
He that overcometh referring to those who believe on the Lord Jesus Christ shall not be heard of the second death
Simple summary born once die twice born twice die once