Putting text in bold may be helpful to emphasize certain matters as part of your presentation materials. People who quickly scan through the text will be guided and look to the text in bold first. Using bold text may be useful but there are a couple of things to consider.
First it is important not to use an "overdose" of text in bold. If you use it too much the text in bold will not stand out anymore (as almost all text is in bold) and the text in bold will have no function anymore. Second think about the text that is not in bold. Do you really need to keep this text? If not in bold it may not be important enough to be part of the presentation materials? Sometimes less is more.