I try to keep in mind that Wikipedia is an encyclopedia. A few things I've learnt — some painfully slowly, some the "hard" way, some instinctively — while editing here are:
Pictures on Wikipedia are supposed to illustrate something in the article. The prettiest picture is therefore not always the best. And very many or very large pictures are best used with great caution.
The best thing with infoboxes is that allows you to add a map pointing out the location of something in a very pedagogical way. Other than that, I can't see that there's much point to them.
Adding a sentence or a picture with a link simply to create a "gateway" into an article which one holds dear is tempting but can be terribly non-encyclopedic. An example is when to an article about an artist adding a picture of a piece of art by that artist with a link in the picture caption to the museum in which the piece of art is displayed, simply to try to attract attention to the city in which the museum is found (yes, I did this in the beginning as well, but have now realised that people who want to read about Tallinn will go to the Tallinn article, not the article about some Swiss 18th-century artist whose name I can't even remember).
I'm not sure people who read Wikipedia and not only edit it actually use categories. I believe they do use navigational templates though. I tend to pay more attention to providing a relevant navigational template, therefore (which is also a great place for redlinks, another things I'm a bit sceptical about otherwise). This is just my personal belief though — based on nothing but my own prejudices.
A more experienced editor also drew my attention to the fact that tags don't solve problems, they just point them out.
For your excellent work on Estonian topics, keep up the great work in addressing systematic bias! ♦ Dr. ☠ Blofeld 15:23, 25 February 2013 (UTC)
The Writer's Barnstar
Good articles, although I've only been through about half of them by now. You might want to apply for autopatrolled right, as I noticed that some of them had stayed unreviewed for quite a long time. Widr (talk) 13:30, 7 July 2013 (UTC)
The Christianity Barnstar
Dear Yakikaki, I award you The Christianity Barnstar for all of your contributions to WikiProject Christianity, especially your recent creation of Gryta Church. You are making a difference here! Keep up the good work! With regards, AnupamTalk 04:52, 8 June 2014 (UTC)
The Sweden Barnstar of National Merit
Yakikaki is awarded the Swedish Barnstar for a series of articles on medieval churches. Ghirla-трёп- 16:38, 6 July 2014 (UTC)
The Gotlandic Sheep Badge
To Yakikaki, For your extraordinary and tireless work on churches and ruins on Gotland, (...and they are many...).
In Gotland, the gift of a sheep in any form is a token of respect and friendship. w.carter-Talk 23:13, 27 September 2014 (UTC)
The WikiProject Barnstar
For your outstanding contributions for Featured Pictures in 2014 you are hereby award this WikiProject Barnstar. Congratulations! For the Military history Wikiproject Coordinators, TomStar81 (Talk) 08:29, 29 January 2015 (UTC)
The Original Barnstar
Thank you for your recent great work on Swedish and Baltic nature reserves. It's much appreciated! Rosiestep (talk) 03:12, 28 May 2015 (UTC)
Dricku is the national beverage of Gotland. The rest of the world is (thankfully) spared. It symbolizes and embodies the rebellious nature of Gotlanders and the harsh island. The un-official and very secret recipe for dricku is this: Take one (1) fairly large juniper. Hack it into moderately large pieces and place in a jerrycan. Do not remove anything! Dirt cleanses your system and spiders and bugs add flavor and protein. Add water and whatever is left in your pantry. Ferment until strong. The alcohol content is always a mystery, do not measure it. Dricku is the only beverage which can be consumed by people who never drink alcohol (see aforementioned mystery). It is also exempt from all laws and regulations about the selling, drinking and handling beverages. Note: All of the above is only valid on Gotland. An annual Dricku-making World Championship is held on Gotland at some illustrious location with a population larger that 14, Ref , Ref . - w.carter-Talk 11:57, 6 November 2014 (UTC)