Question about structure of HTML page

Question

hy everyone
let i have a website of 300 pages created in php or html and I want to change a text in footer or want to add something in body. do I i have to edit all 300 pages? is there any alternative?
let me explain my question !
can we fetch footer, body, head section from single file so whenever we want to change something, we can change it through single file !

Answer 1

I think php would work better.

Answer 2

for permanent changes you could use 'Gulp'. That's a tool which makes repetitively tasks like that.

Answer 3

Maybe with a Javascript file