Why float:left; has no effect_html/css_WEB-ITnose

I just started learning html today, but float:left; has no effect. I don’t know where I went wrong.

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Browser-based

width:1100px; Don’t want this

width:1100px; Don’t want this

Thank you, just remove it, but you can Can you tell me why it's better to remove it? I don't quite understand. . .

width:1100px; This is not necessary

Thank you, it is indeed good to remove it, but can you tell me why it is better to remove it? I Don't quite understand. . .
Because the default value of the width attribute of the display:block block is auto, it automatically fills the entire line.
float will occupy part of the current line. If the next blockl is auto, it will try to fill the current line ( If the content width does not exceed the remaining part of the current line)

The above is very general
You have to find the information yourself for the details. It is actually more complicated

width:1100px; You don’t want this

Thank you, it’s true that it’s fine if you remove it, but can you tell me why it’s fine if you remove it? I don’t quite understand. . . Thank you, I’ll take a look myself,,,,