Government Types

Totalist Commune
Totalist commune has a low amount of tax but a high farming output, electricity, metal, oil, and tech. Totalist Commune is best when supported by Corporatocracy, as the Corporatocracy would buy food from the Totalist commune, even metal and oil. It is not recommended to solo as Totalist commune as you would have a bad start.

Syndicalist Commune
Syndicalist Commune is Totalist Commune, but less militaristic and more economic, as the Syndicalist commune has a bigger farming bonus and less tax debuff, but this causes it to also lose the 60% increase in millitary training time. But this comes with an added bonus of 5% more growth speed.

Welfare Democracy
Welfare Democracy is basically a pacifist, though they have less food production compared to the previous 2, they have a huge growth speed of 40% that will allow you to hold famines for a while and the 20% tech bonus, this is also with the added bonus of less tax debuff. Meaning you could easily get a huge population that pays a lot of taxes and also have the food to support it, because of the tech bonus, It also means you could get a the food output bonuses faster than most countries thus increasing your farming output by a lot.

Capitalist Democracy
Capitalist Democracy has a high tax bonus of 25% but a low farm output and electricity. Basically this is a weaker and more millitaristic version of a Corporatocracy. It comes with the added bonus of a 5% more growth speed rather than the -10% Corporatocracy has. Meaning Capitalist Democracy is a system of Government to have a balanced amount of money, food, and Millitary.

Faux-Democracy
Faux-Democracy is a Capitalist Democracy that it allows you to have a higher population. But this comes at a cost, the -5% tax bonus compared to Capitalist Democracy and the -15% electricity. Electricity is great for HD housing, which has a high amount of population, meaning that Faux-Democracy is a good starting ideology. But not a good one late in the game.

Grand Empire
The Grand Empire is unique because you have a unit called "leader", this gives a bonus to your millitary and your allies that is nearby of the leader unit. Other than that the Grand Empire is a more millitaristic Totalist commune with less farming output but a higher tech bonus compared to the Totalist Commune.

Corporatocracy
In Corporatocracy, you have a huge tax but has a very low food production, so it is highly advised that one of your first research would be to get the food income increase, that will be the start for Corporatocracy. As Corporatocracy, you have an insane economy, you could get a lot of tanks and beat up Russia easily.

Neo-Fascism
Neo-Fascism is a very Millitaristic ideology, It gives no mind to food production or taxes or even growth speed, this is the best in the mid-game as in the early game when you need money, you won't have enough money as a Neo-Fascist. Neo-fascism is useful when you attack against Russia, especially as against the last russian city of Nizthervatosk