You can however Switch to some open source software without having to go full Linux. Introducing Libre Office, Firefox, Thunderbird and so forth can be done in Windows. Software Not working one Linux is often a big problem for switching.

Lenin ended any oppurtunity for none CPSU members to be elected to the Soviets and banned factions in the CPSU in 1921. He then eliminated opposition with the Cheka. Even before that the Communists acted under “war communism”, which meant killing anybody not 100% in line. That very much included Machnos work in setting up a Soviet Democracy in Ukraine, due to them being Anarchists. Stalin then abolished the Soviets in 1936.

The Soviet Union had a bit of it, in the very beginning, but it failed and turned into a statist dictatorship. That is why Stalin ordered the Anarchists to be killed in Spain as well, the Prague Spring got crushed due to moving into a more democratic direction as well as many other movements of worker uprisings.

Socialism means collective ownership of the means of production. The issue with the Soviet Union was that all means of production were controlled by the state. However there was no way in which the people controlled the state, since at least 1936 and argueably earlier then that.

No, it does have a reality. The problem is that an electricity grid can collapse, due to too much electricity. However some power plants can not be easily shut down. Nuclear for example can be throttled to about 50%, but shutting it down requires a restart, which takes a day. So loosing a little money for a few hours can be cheaper then a full shut down. There are other effects, like district heating power plants, which are needed to provide heat, hydro power, which has too much water in the reservoir and waste power plants, which have to burn the waste at some point.

Then you got to keep in mind that Finland is fairly is a country with a small population, which is rather isolated. They cut the power lines to Russia and Sweden and the Baltic countries are also low population and especially Sweden also has a lot of low carbon electricity. So export is not an easy option.

Look fab labs, hacker space, maker spaces or whatever it is named in your area. Those are not exactly everywhere, but common enough to have a look at. Another somewhat related space would be a repair cafe. That would give you not only access to a workshop, but also a bunch of folks for inspiration.

Other then that look up Arduino and RaspberryPi solar projects. It is pretty easy to find some lists. 3d printers are pretty common, as are many other similar tools. Home automation can also be interesting, but that might not be that great of an option, if you rent. Micromobility can also be somewhat interesting(elector skateboards, self assembling a bicycle…). It is also rather easy to set up a solar system in a flat, as long as you can easily install it outside it on a balcony or whatever. There is also a pretty large diy loudpspeaker community, which apparently is pretty easy to built.

Honestly there are lots of projects. Just think of something you would like to have and look up diy version of it. Seriously people built nearly everything at home. There even was a supersonic kit plane sold once, which apparently never managed to go supersonic and had a habit of killing its pilots, but you get my point.