Below are all the best places to find free fonts. Remember to filter your search results on the following websites by the type of licence to make sure you are getting a font that is free for commercial use. You can find out more about licences here
Font Squirrel is my go to site for free fonts. They have pulled together the best free fonts for commercial use from all over the web. Their website is super easy to navigate and they have a comprehensive search function. You can search by font classification (e.g. sans serif), tags, license usage and the number of styles in the font family.
While all fonts on Font Squirrel are free for commercial use the license usage search function helps you narrow down the specific commercial uses allowable in a fonts license. Usage filters include desktop, web, ebook and application.
Dafont has the biggest collection of free fonts online. You could lose hours browsing through the fonts on here. It has a huge list of font categories that you can browse through or you can use their search function. You can filter your search results by the license type and whether or not the font includes accents and the Euro sign. Dafont also includes fonts that can be used for commercial purposes for a small donation to the designer. This is a great option if you are on a budget but are looking for something a little different
Similar to Dafont. It has a large collection of free fonts which you can browse by category and you can filter to show only results that are free for commercial usage
Another font search engine that has a large collection of free fonts for personal and commercial use. Like Dafont, some free for personal use fonts can be used for commercial purposes with a small donation to the designer. Fonts can be filtered by license type, font category and tag
1001 Free Downloads is an incredible resource with thousands of free vectors, photos, brushes, gradients, PSDs and fonts all in one place. Pretty much everything on the site is free to download and use for personal and commercial purposes but you will need to check the license of each file you download for the specific terms as some may require attribution or have other conditions of use. Finding what you are looking for is easy as you have the ability to browse by the type of graphic, and narrow it down by using categories and tag filters. If you know exactly what you are looking for you can get straight to the point and type it into the search bar.
Creative Market is the ebay/etsy for designers. You can find anything on there from vectors, mockups, stock photos, fonts, patterns, templates, icons, illustrations and much more. While most of their items are for sale, in their Free Goods section, each week they have a range of items available for free download. I have downloaded some really nice fonts, vectors and other design elements for free so it's worth keeping an eye out. The font section on Creative market is also well worth a look as the fonts on here are much more affordable, usually $18-25 and because these fonts are designed by independent designers so you won't find them on the major font websites like My Fonts.