Choosing a laptop for a student?

Question

Electronic commerce

Good afternoon!
You need to choose a laptop for study ( Visual Studio, MS Word ) as well as for working in various editors and IDEs ( PHPStorm,sublime ).
The question is what is the most important thing to pay attention to when choosing a unit:

• does it make sense to take top-end hardware (i7 + SSD 8GB of RAM)?
  
• is it possible to confine oneself to a light and thin laptop with the same I3 on ​​integrated graphics?
  
• what diagonal to take ( 13 / 14 / 15 ) ?
  
• Is an ssd required for comfortable work?
  

As a variant of a thin laptop, I chose this laptop
. As a more powerful
variant, please do not offer Apple products. I would like to invest in the budget ~~~~ 40,000 rubles / 15,000 UAH.
Thanks everyone for the feedback!