Create your own hero builds?

Hello, and I have been playing dota 2 for a while, so i am not an absolute noob. And I was wondering, how do you create your own hero builds instead of following guides? Its been bugging me and I really want to know how. Thanks :)

Well i'm not really good in the game but it really depends what heroes you're facing. Like if you are facing hero with a escape mechanism like blink or invis, I would get orchid or something that can disable the enemy (if you don't have a skill that disables the enemy). You should also see what your team needs.

All I can say is from experience, as you learn to play various roles and heroes, you gather an idea of what items are good for what situations and which heroes. Really, I still like to read guides to get opinions and ideas on how to build heroes but really, it should come to you over time. I have about 250 hrs on Dota 2 and I can build a hero relative to my situation and also create a build from scratch however it takes around 2-5 games to get a working build.
Really all I can say is practice, watch others, read. nothing more.

Do you mean creating builds in-game rather than using Valve's recommended Items or other people's guides?

As far as skill build, you need to look at the enemy heroes and decide what spells are more important. I would suggest checking out a couple guides per hero on this site, maybe trying them in a bot game to see how well you do.

For item builds, you need to figure out what skill build youre using, what enemies youre up against, and what items will be most useful. You can edit your item shop by clicking the pencil and dragging items, do this in a bot game so you dont fall behind in a real game. Edit your starting, core, mid and situational items to all possible items you may need, and put them all in order or importance to make it easy.

Hope this helps