What are some practical tools used for machine learning and related?

If you can, answer the question below: Write your answer in the comment box.
What are some practical tools used for machine learning and related?

Will you invest too much time to select the best algorithm?

If you can, answer the question below: Write your answer in the comment box.
Will you invest too much time to select the best algorithm?

Do you assume that corporate leaders always can ask interesting questions that ML can answer?

If you can, answer the question below: Write your answer in the comment box.
Do you assume that corporate leaders always can ask interesting questions that ML can answer?

What are some core and common challenges in Machine Learning?

If you can, answer the question below: Write your answer in the comment box.
What are some core and common challenges in Machine Learning?

What is entropy in decision tree?

If you can, answer the question below: Write your answer in the comment box.
What is entropy in decision tree?

What is a decision tree?

If you can, answer the question below: Write your answer in the comment box.
What is a decision tree?

If the Data Changes i.e. new data comes what happens to k-nearest neighbor and k-means clustering?

If you can, answer the question below: Write your answer in the comment box.
If the Data Changes i.e. new data comes what happens to k-nearest neighbor and k-means clustering?

How is the computational complexity of k-nearest neighbor and k-means clustering? Are they do once and use always solution?

If you can, answer the question below: Write your answer in the comment box.
How is the computational complexity of k-nearest neighbor and k-means clustering? Are they do once and use always solution?

Are k-nearest neighbor and k-means clustering both supervised and/or unsupervised?

If you can, answer the question below: Write your answer in the comment box.
Are k-nearest neighbor and k-means clustering both supervised and/or unsupervised?

What are the differences between k-nearest neighbor and k-means clustering?

If you can, answer the question below: Write your answer in the comment box.
What are the differences between k-nearest neighbor and k-means clustering?