Today I had a great idea,: took take your corrections and put them into Anki as a note card. Today I had a great idea: to take your corrections and put them into Anki as a note card.

You can use a ":" (colon) in this sentence since you are immediately following up on your original statement. The use of "took" in your sentence is past tense and also is lacking a subject. If you meant this sentence to be past tense, you could write it like this: "Today I had a great idea: I took your corrections and put them into Anki as a note card."

But with the advanteage of reviewing my sentences inat any place and momenttime. But with the advantage of reviewing my sentences at any place and time.

But with the advanteage of reviewing my sentences in any place and at any moment. But with the advantage of reviewing my sentences in any place and at any moment.

Also, I couldan review these notes before I forget them. Also, I can review these notes before I forget them.

Use a comma after transitions.

Also, I couldan review these notes before I forget them. Also, I can review these notes before I forget them.

I think that isis could be a useful way to leanrn grammar without realizeing it. I think this could be a useful way to learn grammar without realizing it.

I think that this is a useful way tof leanrning grammar without realizeing it. I think that this is a useful way of learning grammar without realizing it.

You may also say "I think that this is a useful way to learn grammar without realizing it." Additionally, just as a side note, in English it is totally acceptable to drop the word "that" when you use it after verbs like "think" (for example: "I think that it is true" can become "I think it is true" and "I know that she is there" can become "I know she is there"). Many native speakers do this regularly and many do not, it's up to you to decide whether this is a pattern you want to incorporate into your own personal dialect of English! :)