Differences between a study in pink and a study in Scarlet?

I'm supposed to make differences between this episode (a study in pink) and the book (a study in Scarlet) for school.

Unfortunately, I'm really bad at something and don't know where to watch the episode because I don't have Netflix or anything like that

Therefore I ask here now: Can someone please tell me the main differences?

https://fromprinttoscreen.wordpress.com/2016/06/15/a-study-in-scarlet-vs-a-study-in-pink/

others have dealt with this question before you and there's more than one source

you can find the film on dailymotion… And you can read the book…