@jc21.ramos, vote weight is the $ amount your single up vote has at 100%. My vote weight is $0.005. (that is at 100%).
Vote power is how much you up vote a blog. If you have a slider in your up vote button (you get a slider after some 500SP in your wallet), you can vote only a fraction of your full vote weight. For example if your single up vote is say $1.0, you can distribute it to up vote 10 blogs at $0.1 using the slider. That is vote power (10% of your full power) that you are using for upvoting a particular blog

Voting power decreases with each vote. Voting frequently in a small amount of time increases the rate at which voting power decays and it recovers slowly after a period of not voting. You get 10 no. 100% up vote every 24 hours. Meaning you can up vote 10 blogs /comment everyday at 100% without diluting your voting power. After 24 hours your voting power is restored to full.
In steemnow.com you can see your voting power in %age. Just see that it does not go below 85%. If your voting power dips below 85% then every subsequent up vote that you cast will have less than full 100%power.
So if your voting power is say 50% every up vote you cast has only 50% value of your up vote. (That is if your full up vote value is say $ 1.0, and if your voting power is 50%, then each up vote is worth only $0.5 and not $1.0)
Hope that clarifies

This is my understanding. May be some senior here can clarify or throw more light on it.