Rename folders + misc fixes

🔰 Grammar/Opposition.md

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+# Opposition
+
+## が
+
+Between two sentences, it has the meaning of "but".
+
+> [!info] Example
+> この{建物|たてもの}は大きいです==が==、トイレは{一|ひと}つだけあります。
+> This building is huge but has only one toilet.
+
+## でも
+
+This is the basic way to say "but".
+
+> [!info] Example
+> コンビニに行きました。==でも==、何も買わなかった。
+> I went to the convenience store. But I didn't buy anything.
+
+## しかし
+
+This is similar to でも, meaning "however", but usually more formal and most commonly found in written form.
+
+> [!info] Example
+> {戦争|せん|そう}は{悪|わる}いこと。==しかし==、{人類|じん|るい}はいつも{戦|たたか}っています
+> War is bad. However, humanity is always fighting.
+
+## けど・けれども
+
+けれども is more formal than けど. Contrary to でも (which is more stand-alone), this links two clauses. The second clause can also be implicit and not said.
+
+> [!info] Example
+> {外|そと}は{暑|あつ}い==けど==行きたい。
+> It's hot outside but I'd still like to go.
+
+It can also be used to soften your assertion.
+
+> [!info] Example
+> {明日|あした}に行きたい==けど==。
+> I'd like to go tomorrow... (but I don't want to cause any inconvenience).