# Resources for understanding Pkg3

**URL:** <https://discourse.julialang.org/t/resources-for-understanding-pkg3/13799>\
**Category:** General Usage\
**Created:** [August 21, 2018, 1:10am UTC](https://discourse.julialang.org/t/resources-for-understanding-pkg3/13799 "2018-08-21T01:10:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![cstjean](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/cstjean/32/1444_2.png) [@cstjean](https://discourse.julialang.org/u/cstjean)\
**Post date:** [August 21, 2018, 1:10am UTC](https://discourse.julialang.org/t/resources-for-understanding-pkg3/13799/1 "2018-08-21T01:10:10Z")

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I’ve read the [docs](https://docs.julialang.org/en/v0.7.0/stdlib/Pkg/), watched the [youtube video](https://www.youtube.com/watch?v=HgFmiT5p0zU), spent two days trying to make it work, but my level of understanding is still abysmal. Are there other resources / posts to recommend? I get that it’s early days for Pkg3, and that it will improve soon, but we’d like to release a piece of software soonish, and it’d be nice to do things properly.

In particular, the description of the `add, instantiate, resolve, up` functions makes sense conceptually, but what do these functions really _do_? And how does Julia figure out which package to load, with which version?

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**Author:** ![crbinz](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/crbinz/32/1919_2.png) [@crbinz](https://discourse.julialang.org/u/crbinz)\
**Post date:** [August 21, 2018, 3:23am UTC](https://discourse.julialang.org/t/resources-for-understanding-pkg3/13799/2 "2018-08-21T03:23:31Z")

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I’ve been searching for the same, but I have yet to find anything. I read and follow every Pkg3 discourse post, which helps some, but even after some practice now I feel like my grasp on Pkg3 is tenuous at best.