Fertilizer is a good idea, but if you are starting out and your main concern is simply keeping your plant alive you don’t need to get worked up about it. Fertilizer can transform your houseplant from weedy to wonderful, but too much will cause your plant to overdose and die.
If you decide to fertilize, it is best to do so in the warmer months when the plant is growing. Dilute fertilizer with water and administer in small doses. It is comparable to vitamin supplements. Plants are good at producing their own food but most will need a boost from time to time. Another way to restore your plant’s nutrients is by repotting it with a batch of fresh soil.