How to model is two cupboard legs can anyone help?

Hi @su14
Welcome to the Rhino Discourse. The pictures you’ve attached are really hard to read - I simply can’t tell if those legs are flat or round, wood or steel. They look fairly simple, so what problem(s) are you running into? When asking questions here, it’s a good idea to clear, precise and descriptive, post any references you might have and - not least - post whatever you have so far in terms of Rhino-file. Even though this link originally pertains to Grasshopper, the advice given is equally sound for Rhino:

HTH, Jakob

can you suggestion any YouTube channel for making furniture and interior design

Hi @su14
If you haven’t already, start by going to Help>Learn Rhino>Getting Started and take it from there. Depending on your previous experience with 3D modeling, there’s a lot to learn, and the best place to start, is at the beginning: Learning the very basics of Rhino, such as how the interface works, how the various types of geometry differ from each other and how to go from design intent to actual 3D model. Rhino’s tutorials are a great place to start - there’s even a section pertaining specifically to furniture, and a small course covering some of the basic concepts.
-Jakob