How do you document your bugs and errors?

I found myself repeating the same errors and bugs almost every month.

Here is the scenario: I encounter a bug today, googled it, and found the solution, then one month later, working on another project, I get the same error, so, I have to redo the same process of searching, sometimes.

Do you have any software you use to document your bugs along the way? How do you do it? Please help me