Rajoy visits scene of deadly derailment, meets officials, visits hospital

The video tutorial introduces the concept of portability and emphasizes the importance of understanding and knowing this concept.

What is the main topic introduced in the first section?

• Flexibility

• Portability

• Durability

• Sustainability

Why is it important to understand the concept discussed in the second section?

• It helps in making informed decisions.

• It is only relevant to engineers.

• It is a trending topic.

• It is not important.