It's true that Webflow is a visual website building tool, but it doesn't mean you should just tweak things as you go until it looks good. PLAN before you start any project!
Learn about the box model and how spacing works.
Use margins and paddings with care. Use position very very sparingly.
And NEVER set a default value again. Default = 0, you want value 0? Don't edit it. Same for value Auto or any other value for that matter.
Now, try to remove all those settings i talked about above for each element, and rethink them carefully. Use pen and paper if you must.
Also learn flexbox, helps A LOT.
And never ever hesitate to ask for help here in the forum. We are glad to help and teach everyone.
Best of luck,