menubars

top right tab bars :

default geometry:
Box:self explanatory

Sphere:self explanatory

Tube: can be a cone too



Torus:self explanatory

Grid:

Metaball:

L-system: a type of geometry that you can program, it is fractal in nature and works well for building trees, L-systems have there own language to code the bends and turns of their branches and how they behave ,

Platonic :can pick from a set of default platonic shapes, ( soccer ball, teapot, ect..)

Curve:

Circle: self explanatory

Font:easy way to add 3-d text ,

File: allows you to read in Bgeo's , Obj, Geo files/ sequences this saves Houdini time on renders by not having to recalculate moving objects that are already cooked.

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top Middle tab bars

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left side menu bar

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right side menu bar

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bottom : play control

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channel