I tried my best to express my question

[tulobkonel]

We understand the basics of networking and ccna stuff okay fine but how to design a network successfully with issues , like how to make sure that your network is efficient and every device in its right place Like how set up a proper redundant topology What courses i need to learn What skills needed for it

[Karsten Iwen]

For training, I would go for "Designing Cisco Enterprise Networks":
https://www.cisco.com/site/us/en/learn/training-certifications/exams/ensld.html#tabs-35d568e0ff-item-4bd7dc8124-tab

[Martin L · Accepted solution]

there is no simple answer; there are many factors to consider when designing networks; I would go to CCNP Enterprise exam resources and look at 2 concentration exams about designing.

Also, see old and new books from Ciscp Press; new one for CCDE is here. 

more details at CCDE and CCNP resources pages

Regards, ML
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[Martin L]

https://learningnetworkstore.cisco.com/on-demand-e-learning/designing-cisco-enterprise-networks-ensld-v2.0/CSCU-LP-ENSLD-V2-028153.html

https://www.ciscopress.com/store/ccnp-enterprise-design-ensld-300-420-official-cert-9780138247263