Selenium Web Browser Automation

I had this question, found a privated reddit post, so I figured I'd ask again :)

I'm basically trying to figure out a minimal container that can load pages via selenium and take a screenshot.

"I am presently using a firefox gecko driver with python in ubuntu for my auto testing. The problem is it uses a very high memory about 150-350 mb and also cpu for a single site. Is there any lightweight selenium web drivers which uses less system resources? Can you recommend any? "

Manual QA here want to start learning Test Automation. Coming from a non-tech background will make it a bit of a challenge but I'm looking to "test" myself.

Out of the three languages (Java, JS, Py), which should I focus on learning to get the best knowledge to apply when eventually using Selenium WebDriver?

I would like to comprehend all three later on in the future but for now which is the best to start off or continue with. Many have mentioned Python is beginner-friendly approach to learning programming and less stressful, but I see a lot of tutorials for Selenium webdriver being taught using Java, Also I heard JS is being implemented a lot more and more nowadays.