Hmm.. this is going to be a process that can take some time.
At one point, everyone was a novice, so we can all appreciate where you're at. Your first step is going to be reading. Lots of reading. One of the first things you'll need to learn is the mechanics of your notebook / laptop PC. You can view the manual for it, here
. All of this reading is going to generate questions. Lots of questions. The best places for answers will be in forums or sites that are dedicated to people that have a common bond - in your case, Lenovo notebooks. A forum for Lenovo PCs can be found here
. There are other sites dealing with Lenovo PCs, too. A list of those can be found here
. Due to the large number of people on these sites, you will be able to get the fastest and probably some of the most reliable feedback and answers on those types of sites.
Once you begin to understand the PC, the next hurdle will be learning the OS or "Operating System". Most likely, you've got some version of Windows on installed, but you may have a flavor of Linux or something else completely on it instead. You should google
the OS and help
for examples. Then, look for OS forums in google like this
. Here again, asking questions in forums where the users all share a common bond (your particular OS in this case) will give your question the greatest exposure for a speedy reply.
You will find an incredible number of books written to help people understand their OS in libraries, online and book stores. You will find books on common, mainstream PCs too - and your IBM T61 is probably not an exception unless it is an older PC (I haven't followed the Thinkpad line), but online will be your best bet for anything that is no longer current.
This answer is pretty short for the amount of work that lies ahead of you - but if you stick with it - you'll learn a great deal and might even have some fun while you're at it. Good luck! Please rate my reply - thanks.