You can win shares in tons of contests. Check the sbi blog for a lot of them. Also @contest kings has a daily post with a lot of contests for various prizes - over 30 today. You can also sponsor someone by sending 1 steem. Look in the @steembasicincome wallet to see how people do that. Two people get a share - the person who sends the steem and the person they send it for.
I mostly enter contests and have close to 200 shares now. Sometimes I run my own contests and give them as prizes.
This gives a great upvote on all of my posts. In the beginning you will barely get votes, but keep accumulating shares and you will soon have many and a good upvote too. It's all about the upvotes here and this is a good way to get them.
Good luck!
I think I have one share. How can I use it now? With that share, I get one vote from steem basic income account to one of my posts? I choose the post?
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No, it's not like that. You need more shares to get a consistent vote and it comes when you have enough "power" built up with them. You don't really "use it." They vote your posts when enough value is there to do it. I have close to 200 shares. I get about a 4 cent vote on 2-3 posts each day. So with one share it will take a long time to build up.