how i can edit the files of my website after publish it
Because I could see that you did a manual deploy, you’ll need to update the files on your computer and drag n drop them back to your deploy page 
ok thank you so much for ur help
one more question if i change the name of the start file to index.html that will work?
It’ll need to be in the very top directory on your site (so take it all out of the folder it’s in and put it at the very top) and it will
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last question how can i see how many visitors visit my website
You’ll want to purchase Netlify Analytics or look in to an alternate solution such as Google Analytics
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