Biden Leading Trump in the Polls???

So last I checked it looked like Biden was leading in the polls by 7 or 8 points.
48% to 40% or close to that.
It appears after the RNC that Trump gained ground.
I didn't watch it but I caught a replay of that Fireworks Show which was pretty awesome!
I find it strange though because when I read comments all over the net all I read is Pro Trump.
I was looking at youtube and watching some videos about Biden debating Trump.
It was a constant storm of how Trump will destroy Biden in one on one debate.
These polls have to be wrong as it appears Trump has more support than they suggest.
I don't know if the Mail In Voting is good or bad but it will enable my family to get 2 extra votes for Trump that he normally wouldn't get.
That is because those two individuals have no clue how to vote in person.

https://www.youtube.com/watch?v=AvyVpr3FNeQ

https://www.youtube.com/watch?v=rZr8bno5qXo