Welcome to community!
As for the first problem, it’s clear that your shapes do not match (as suggested by Shafin).
As for the second, there’s a post against which you could check your values.
As for the third, you should fix the first two problems first. Then, there are posts like this and this.
In general, it’s beneficial to explore questions already asked by other learners (by Course and by Week). You could also make use of the search function of this forum (magnifying glass at top right corner).
Cheers