Too is a substitute for also. This also annoys me. This annoys me too.
Too also can be used to mean excessive, as in too big, too loud, too beautiful.
To explain something within the sentence without finishing the sentence before explaining.
Sometimes. It depends on the sentence.
I see you are going to the movies,I too, am going to the movies.
The pig ate from the trough.
There are few magnanimous people in this world.
Yes, you can start a sentence with "if" to introduce a conditional clause. For example, "If it rains tomorrow, we will stay indoors."
I wouldn't put too much thought into that.
There are too many possibilties. You need to put it in a sentence.
By putting as much description but not too much
She loved the gift but it was too extravegent
Many people feel that introverts are too inscrutable.
Put it in a sentence: too many ways to translate the word.
A person could easily die if they are too gullible.
The chicken pie was very salty as too much salt was put in while cooking
The word blabbering is fun to put into a sentence. For example, "She wouldn't stop blabbering, so I stopped listening to her." It means a person is talking too much.
Yes, it is generally a good idea as it prevents that sentence from becoming too long. It is like a "pause" in the sentence.
I contemplated doing the project myself, but it would have taken too long.