well, there are o ton of articles about it. Not to mention youtube people explaining how the voting power works. No point for me to type again what was already written so:

read the first comment:
https://steemit.com/steem/@tuck-fheman/how-is-voting-power-determined-in-steem

a very detailed post about steemit in general:
https://steemit.com/steemit/@shenanigator/updated-steemit-faq-section-voting

and an extensive video for you:

be patient and do the research.