Since Jesus came to bring resurrection - the Fourth Gospel also shows what resurrection means - shows what happens after our bodies die.
First we see Lazarus (author of the Fourth Gospel) resurrected. He has been dead a few days, his body has begun to decompose - and he is resurrected to resume his discipleship. It seems to be implied that the damage of putrefaction was healed (he isn't a zombie).
We aren't told what happens to Lazarus after writing the Fourth Gospel - but I have come to assume that at some later time he followed Jesus, ascending to Heaven.
Then we see Jesus resurrected two days after being beaten, mutilated, crucified. Something seems to be different, because he is not immediately recognisable - but he retains some marks of his mutilation. He also eats and drinks. And seems able to appear and disappear. He later ascends to Heaven.
What I wish to emphasise here is the Fourth Gospel shows us that resurrection happens soon after death - a few days. There is nothing about awaiting a second coming, or a long sleep awaiting a day of universal judgement - there is no mention of a such matters in the Fourth Gospel.
The implication is that resurrection happens - if it is going to happen, and I presume there are other possible outcomes - soon after we die.
We will then be solid, incarnated, indestructible eternal Beings. According to the Fourth Gospel, we then 'ascend' to Heaven - where we will meet with God, Jesus, and other resurrected Men who have followed Jesus. So there are other 'solid' Beings in Heaven. It seems to be an actual, solid place.
And there are also unincarnated spirit Beings. For instance, Jesus says he was in Heaven as a spirit before he was incarnated as a Man.
So Heaven seems to 'house' both spirit Men (who may, or may not, be incarnated at some future time) and resurrected Men. Apparently, Heaven is a place where the spiritual and incarnated are in full relation and interaction.