Hi Piotr, This is a post with questions close to my heart. Let me answer to them one by one:

A. What is the best way to spend your first crypto?

In my view it is too early to spend Crypto. It is time for accumulation. Find a solid portfolio of projects

1. where you have some where you expect the value to increase because they have a solid foundation with a promising product
2. where you can earn passive income by either staking or contributing like in case of Steem.

Continue to build until you reach the moment when you can use your passive income in crypto to increase the quality of your and your families live. Than start spending only your incremental crypto.

B. Who are the crypto industry leaders in your view and why?

I would name three people here for totally different reasons:

• Charles Hosikinson founder of Cardano, as he is building the most solid version of a smart contract blockchain which will be a huge competitor for Etherium as it is becoming much more mature, more safe, more accessible and cheaper to use. This in my view will be the future smartcontract blockchain solution for Enterprises
• Justin Sun founder of TRON. He is building a beast working towards Internet 2.0 run on blockchain. His style is very abrasive and hated by many, but he is building solid products in a great speed all connecting to each other. BTT for decentralized storage, DLive for videostreaming with BTT as a base. JST for decentralized finance with swapping and lending solutions and of course TRON which is the glue binding all together.
• Shahaf Bar-Geffen, the CEO of COTI (Coin of the internet) this is a payment solution blockchain based, which is on its way to become a huge competitor for Paypal especially for merchants who have received the label of risky business only because of the market segment they operate. As a node operator for this blockchain it is already providing me with a nice base of passive income as indicated in question A
  C. How is the crypto world going to look like in 5 years and what are the most important initiatives today that will take us there?

This is the question requesting the highest level of speculation. But where 3 years ago, a project would get a lot of funding only based on a nicely written whitepaper, currently a project gets popular if it has any connection with Decentralized Finance. In my view in the next 5 years, the adoption of crypto will increase and only the projects with a real use case will survive. This is why I am bullish on projects like ORN, Tachyon Protocol and COTI, which are projects which have a real use case with real revenue generated which is shared with people supporting its infrastructure by staking tokens and providing nodes. Besides this I am still looking for the next censorshipfree versions of Twitter, Facebook and Youtube build on blockchain. In the end my prediction is that Internet will run on the blockchain in 5 years time. Where Etherium will be bypassed by some other blockchains, but Bitcoin will remain the king of crypto, as a solid store of value.

This is my contribution. Thanks for the great questions.