You can draw your own data easily - the key word to look for tutorials is 'georeferencing.'
Very glad it was helpful!
The ? problem has to do with the encoding of your file. Try some of the answers from here. As for your labelling, I'm not sure without having a look at your attribute table but my guess would be that the data is coded as a string rather than a number or date, so using year() breaks it. Do you have two overlaying layers with the same data? What does your full label settings look like?Crossposting from the map thread. Thoughts?
No legend, etc., etc. but there are bigger problems here. Why does the ć character result in ? when rendered on the map, when QGIS can handle the character fine in attributes text fields prior to rendering? Why do the battles listed have "0" next to them as the date, when by the formula below I should clearly be pulling a good year from the attribute (see at the bottom for example, "1379" for "Battle for Ragusa", yet "0" next to it on the map)? How can I conditionally format the map so every symbology, no matter the layer, outside the green polygon gets opacity 0% (invisible).
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As for hiding everything but the green what I would do is use Select by Location to get everything inside the green polygon, then invert and just delete everything outside. Alternatively you could make a sheath polygon with Clip or the method @skozik detailed above, bring it to the top, and then just make it white to cover everything else.
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