First of all, why would you want to make your own wiki ? This may seem like a bad, or just not-so-good, idea when you say it, but let me explain why you should consider it.

Either you are into computer science or not, a wiki feels like the best place to have a documentation about your passions, job or any other topic that you could share to others, or that needs a strict configuration process.

Even if you think that what you've done is only for yourself and would not interest anyone, others may be in a situation where they would have to, or like to, reproduce part of your work, and letting them know how to do so via a documentation written while you were fresh about a topic is way better than trying to remember each step correctly weeks, months or years after you've done them: in case you have a wiki page about it, you just can throw them the page link et voilà.

On top of this sharing knowledge advantage, and as mentionned, you will forget stuff as time passes, so to have solid bases, and because it's easier for you to search on your own wiki about a topic once it starts fading out of your mind, having a wiki will be an advantage to prevent time loss over tasks you've done before.

On top of that need for strict directives, documenting your journey, your difficulties and how you solved them is a good way to aknowledge what you've done, been through and accomplished, either you want to aknoledge others, or yourself.