I highly recommend checking out some of his videos on YouTube.
You really should take a look at his YouTube videos.
ーI highly recommend checking out some of his videos on YouTube.
「彼のYouTubeビデオを見てみて！すごいオススメだよ。」
highly recommend で「強く勧める」
check out「見てみる」
ーYou really should take a look at his YouTube videos.
「彼のYouTubeビデオをぜひ見てみて。」
take a look at ... で「〜を見る」
ご参考まで！
カナダ 
