Jesus healed on the Sabbath

I'm a bit confused at times with the Bible.

In Numbers 15:31-36 it tells of how they killed a man by stoning him because he was gathering wood on the Sabbath.

But I've heard scriptures about Jesus healing on the Sabbath

https://bible.knowing-jesus.com/topics/Jesus-Healing-On-Sabbath

And also Jesus allowed his deciples to pluck the ears of corn on the Sabbath : 

https://medium.com/@hui_gai/god-clearly-knew-that-it-was-the-sabbath-day-then-why-he-still-chose-to-go-out-and-plucked-the-c00890b1d29f

Love when you get another perspective on it x