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If you can learn how to combine your technical prowess (build products) with the ability to sell (sell products) then you will become unstoppable.
I think there is never a situation in which people should be discouraged from learning sales, particularly if they are interested in it.
Two ways to learn sales off the top of my head:
1. Do a sales internship at a tech company that is near your university
2. Hack together a product in your spare time - something simple like
https://www.bingocardcreator.com/ - and then try to convince someone to buy it.
3. Find a niche service on
http://www.fiverr.com - like logo design - and find someone who will provide multiple iterations on the logo design. Then find some local businesses who might need a new logo. Try to sell your service for $250 USD and make money on the difference.
In a broader sense, you get sales experience by trying to convince people to give you money in exchange for products or services. The best option for you is to go intern in a sales role in a tech company. Explain that, while you are studying a technical field, you are interested in getting practical experience in sales, which you will never be able to learn from books.
In a business, sales solves everything. There is never a bad time to know how to sell and that will always be true.
Throw in something like copywriting on top of that and you'd be invincible.
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