i suggest you to learn the difference between は and が seems u always mix these up when u speaking in Japanese 1:17 like here, これが is incorrect and definitely sounds unnatural in this case, should be これは instead.
@@tobisho32 "I suggest that you learn" is more natural. It's quite an unfriendly way to talk though (unless you are his teacher or know him well). It sounds strict. It's Ok to say "You should use は in this case" because you are explaining strict rules, but "You should learn this" is just your opinion not a strict rule ('he can learn whatever he wants to learn, why are you being so unfriendly' is what I would think).