Assalam u alikum Warah matullah, I hope you all are doing well. I am publishing my Task 4 post for Achievement 5 to get verified this achievement in Newcomer's community. Now I will try to answer the questions.

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1. How do I see the "recent history"?

For this purpose I open the site steemdb.io site. Then I will select Account options. Then I will see a page having information about multiple accounts in rich list.

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I will have to insert my username in search option. Then I can get my account recent history easily.

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2. How do I check the different activities: Posts, Votes, Reblogs, Replies, Rewards, Transfers, etc

For this purpose I have to click on the activity section from the same page. The Activity button is in the top bar.

After clicking on Activity button we see the drop-down menu, where we can choose what to check and what to click. We can check our posts activity, votes, reblogs, replies and rewards activity from this section.

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3. How do I know who has reblogged my post: (Social: Follower, Following, Reblogged)?

For this purpose we will click on Social Button from the same page and a drop-down menu will open.

Then after clicking on reblogged we can check who has reblogged my post. This will include the history of getting reblogged by others of my account. That who, and when reblogged my post, and which post the user reblogged.
As well as I can check followers of my account and my following accounts.

4. How do I check my Voting Power?

This can be checked on the same page on steemdb.io. this is at right and down of any account details.
This is the example;

I checked this details of steemcurator03 account because of my account is not showing in the search bar. Whenever I enter my username it gives me another username of growwithme420. And, that's not mine. So I hope Greeters will accept my achievement 5 task 4 post, and understand my problem.