Also, what is the age of the computer (ie) how long have you had it? A blanket question like this is like saying "How do I make my car run faster?"
If your computer is several years old, you can upgrade the RAM and replace the HDD with an SSD, but the processor is still going to be slow, at that point, it is cheaper to by a new laptop then to upgrade your old computer.
I would also generally look if you can upgrade your computer hardware, like CPU, SSD instead of HDD and a greater RAM. If your PC got slow because of many data etc. then you should use a cleaner and clean your disks and defragment them.
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