The following are some points you need to consider while creating 3D Models:
- Maintaining quads so that you do not have any issues when deforming the model
- Checking Surface Normals
- Maintaining proper naming, grouping, and hierarchy in the OUTLINER
- Optimizing the scene file. Delete surface history and unwanted Shaders, Layers, and Nodes
- Exporting in 'FBX' format