The 2011 MacBook Pro has become affordable enough that even if you cannot afford a new MacBook pro you can still buy an older model that offers close to the same performance as new models for about $400.00. If you add a few upgrades you can have a very capable machine.
RAM is the first upgrade I suggest. This model ships with just 4GB and you can double the ram on the 2011 Macbook Pro 13 inch to 8Gb for about $50.00.
The hard drive is the really weak spot on this particular machine. It ships with a 500GB drive but I suggest you replace it with a much faster SSD drive. 500GB SSD drives are now priced at under $200.00. If that’s too much a 256GB SSD is priced at about half price at $100 or so.
The battery is the last update I would suggest. This a six year old portable computer and it will cost from $30-50 for a replacement depending on whether you opt for a 3rd party battery vs a Genuine OEM model
If you add the total cost to spruce up this computer your’re looking at about $700.00 for a MacBook Pro with a fast SSD, maxed out ram and a new battery. At this price you might consider just buying a new MacBook Pro but that’s your choice. If you already own this model of MacBook pro then the upgrades are reasonable and will get you a few more years out of your MacBook Pro 13