If you are struggling to install the dashing based UI, as per @kubawolanin’s post above, I would recommend that you use HABpanel. This is now the official dashboard UI for OH - the dashing based solution in my github was before HABPanel came along as I needed a solution at that time.
HABPanel does allow custom widgets and if you are happy with coding, you should be able to replicate more or less everything from the dashing solution. I suggest you have a look in the HABPanel template thread, e.g. Template widget - tutorial & examples - make your own widget! - #68 by Foxejoe
I just saw your other post above. What that statement means is that different distributions of linux have different requirements. It is up to you to modify the code given to your needs based on the distribution you are using. e.g. I have never installed on an RPi. Thus my instructions do not cover that use case. Again, I would strongly recommend that you use HABPanel rather than going down the dashing route, especially if you are not familiar with linux.