hi im making a website for a school project, this is my first one

my website is divided in "sections" so like i have <div id="section1">

but after and before every section the is a big margin

how can i fix this

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im not english so sorry for the language

https://preview.redd.it/uff35klompb61.png?width=1613&format=png&auto=webp&s=fc45d9fd7647c3c76a8a7e08acdbab9c3a591cb1