To give your photos a personal touch, edit them before you share them.
You can spend hundreds of dollars on photo editing software or, with a little research, you can achieve very similiar results without spending a dime.
This video from TechGumbo goes through the top 5 free photo editors (Summer 2018) in this short and to the point video.
NOTE: Only GIMP and Photoshop Express allow for the direct editing of raw and JPG files. All others accept JPG files only (plug-ins not applicable).
Adobe Photoshop Express is a lilmited version of the well-known and all-powerful editing program Photoshop. Photoshop Express will give you what you need to do basic editing as well as some more complex techniques. Like most software programs there is a bit of a learning curve to go through.
Krita is primarily a painting program and as a result it opens a lot of new ideas and opportunities to take your photography to the next level. If you want to use your photographs as a base for an image this is a great program that will let you make more than a photo to share with others.
Pixlr is a powerful online editing tool. No need to download anything as all edits are done within the confines of the cloud. This won't be your final solution if you want to edit in raw or Tiff formats. If you work with JPG images, this is a great, free, way to take your photos and your ideas to more adventurous territory.
Paint.Net has been around for a long time. And because of that long history it is only available on PCs that operate on Windows. First developed as a college design project with support from Microsoft. It has grown to become much more over the years. With tons of turorials and an active support community, Paint.Net may be all that your photos ever need.
GIMP is another free photo editing software that has been around for a long time. GIMP is often considered the ablsolute best free photo editing system. This open operating system is supported by a large large community that offers all the support you will need to make use of the program. And you may need that help. GIMP is not an intuitive system. But once you get the hang of it, like everything else, life becomes a little easier.