Logic behind BeautifulSoup data-parsing

[snippsat]

So basiclly request_html is the same as Selenium with headless-option (as far as getting html code) ?

Resource wise it will be the same as request_html use pyppeteer(headless) chrome/chromium browser automation.

If i would choose to use Selenium this time, would BeautifulSoup be unnessecary then?

I wanted to learn Bs4 in this project, would it be foolish to combine Selenium and BS4 ?

It's fine to send browser.page_source to Bs4 and then do parsing with Bs4.
Example:

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from bs4 import BeautifulSoup
import time

#--| Setup
options = Options()
options.add_argument("--headless")
#options.add_argument("--window-size=1980,1020")
browser = webdriver.Chrome(executable_path=r'C:\cmder\bin\chromedriver.exe', options=options)
#--| Parse or automation
url = "https://www.youtube.com/channel/UCwTrHPEglCkDz54iSg9ss9Q/videos"
browser.get(url)
# Send to BS
soup = BeautifulSoup(browser.page_source, 'lxml')
title = soup.select_one('#video-title')
print(title.text)

Output:
WE FISH THE SAME SPOT FOR 12 HOURS - Amazing Results!! | Team Galant