Will Pianoforall help me playing right hand melody and left hand arpeggio after I complete the course?

I'm also a beginner but just get a book and stick to it. From what i've seen recommended by experienced persons on this subreddit is to definitely get a teacher, 1 hour a week is enough.. to guide your learning and ensure no bad habits.

Otherwise, this is a highly recommended book https://www.amazon.com/Alfreds-Basic-Adult-Piano-Course/dp/B07G4TW59B/ref=sr_1_1?keywords=alfreds+adult+all+in+one+course+book+1&qid=1665182485&qu=eyJxc2MiOiIyLjc3IiwicXNhIjoiMi40MCIsInFzcCI6IjIuMzIifQ%3D%3D&sprefix=alfreds+adu%2Caps%2C212&sr=8-1 (Get the spiral version)

And this piano playlist is like your own free teacher guiding you through the book :) https://www.youtube.com/playlist?list=PL8hZtgRyL9WRWJLlIUPl-ydiDc8CZ_SJK

/r/pianolearning Thread Parent