Wesnoth is tactical, not strategy. Its a good game (albeit too luck based IMO... Just get used to the "luck swings" of battle), but a totally different genre than 4X / Strategy.
Civilization is on the easier / simpler end of 4X / Strategy... and believe me, this is a good thing!! Things get really complicated. Paradox games (Victoria, Hearts of Iron, Crusader Kings, Europa Universialis) are the "complicated" games, technically realtime but the underlying simulations "feel" turnbased. (Hearts of Iron progresses the simulation in 1-hour increments. They're "realtime" only because it'd be too boring to hit "next turn" so often, but you can hit the pause button and really think about a situation at say: September 1st 1939 @ 1pm if something terrible is going on)
Romance of the Three Kingdoms is also a strategy game: war, tactics, resources, diplomacy, etc. etc. The elements you'd expect.
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"Tactics" games that focus on a singular battle as the core gameplay loop. Fire Emblem, Wesnoth, Wargroove, Advance Wars, Heroes of Might and Magic, Panzer General, Starcraft, Age of Empires.
"Strategy" games approximate the battles and focus on larger scale elements.
A good rule of thumb is that Strategy Games have an element of siege and supply lines, while Tactics games often just "teleport" the resources where needed. Tactics are about maneuvering your troops to get an advantage, Strategy is about finding / securing resources (ex: placing your defensive Pikeman on the enemy's mine in Civ2, or in their districts in Civ6)
Civ leans towards the simpler/tactics side, but is just barely enough "Strategy" that I'd group it in the strategy side of things.