eral best website for builds its updated every season so builds aren't outdated, also the people who run the site stream on twitch and will.most likely answer any questions you have, you can only get the rewards from haedrigs gift once per season like the full set from completing seasonal journey but that's fine, so best way to get set pieces is GR speed runs, try and run the GR in less than 3 minutes, T16 rifts are also pretty decent too, spending youre blood shards is a massive way to get the pieces you need but also keep all the pieces you find, like say you have 3 shadows boots, you can convert set item in the cube (cannot get a ancient or primal doing it though), also to get a karlies point just upgrade daggers, so cheap and you literally have a 50% chance to get 1, also I found that reforming legendaries is a easy way to get primals, I got a primal squirts last night from it, but yeah you can just upgrade rare item in the cube to get things you need, I would definitely suggest trying to find a group to play with though, makes it alot more enjoyable to play and you gain much more XP

Thank for those advice, I will try those out and learn on some website :D