Hi @sathsara93 nice that you and @kalpa-sameera interested in learning more about steem ecosystem. I have some notes about the outdated information from this article https://steemit.com/steemit/@rickyjrx/steemit-101-upvoting

WHAT WILL VOTING EARN YOU?
So many minnows don't understand how curation rewards work, so when you upvote content the author of that post will receive 75% of the value of the post and the remaining 25% is distributed to the upvoters in steem power based on the Steem power of the upvoters.

After Hardfork 21, currently now we have been through 23 Hardfork in total since 2016 https://steemit.com/steemit/@steemitblog/the-announcement-of-hardfork-23-0
There are some changes in the protocol/code and now the situation is like this:

"so when you upvote content, the author of that post will receive 50% of the value of the post and the remaining 50% is distributed to the upvoters in steem power based on the Steem power of the upvoters/curators.."

This is a good explanation on what is Hardfork https://steemit.com/normietalk/@justineh/normie-talk-hf21-explained-sps-eip-what-it-is-and-what-happens-next

I hope you both have seen this post on the compilation of all the tasks for Newcomers Achievement Program. All the basic informations you need as newcomers are there.
https://steemit.com/hive-172186/@cryptokannon/achievement-tasks-resources-and-materials-newcomers-retention