How many cells can I create in a Notebook? Also are there any guidelines on the number of lines of code in a notebook cell?

[brickster_2018 · Accepted solution]

Although not a hard limit, it's recommended to keep the number of cells in the notebook less than 100 for better UI experience as well as code readability.

Having a really large block of code in a cell defeats the purpose of notebook execution and also makes it difficult to break down and debug. Hence it's best to keep the lines of code short.