How much Space reserve to MAC OS Partition

Hello :)

I would try to install mac os on the new hdd thet i will buy, but how many space i have to reserve considering that i will keep the data on another partition/hdd?

It's my first time on MAC OS,so I do not know which applications I will install, I do not think I will install particularly heavy applications.

100 GB ? or 150GB ?

submitted by /u/Rosssiiii
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