Editing is currently done by almost everyone if not all, and therefore it has become part of daily lives. I have personally used these apps for such purpose and I recommend it for you having confirmed there legitimacy
Edit seamlessly and smoothly using capcut
CapCut
Mobile editing app for graphic designers
PixelLab - Text on pictures - Apps on Google Play
Turn your documents into Pdf without struggle
Clear Scan - PDF Scanner App
Transfer your files from one phone to another effortlessly
Xender - Share Music Transfer - Apps on Google Play
Edit effortlessly using your mobile phone
Snapseed - Apps on Google Play
Effortlessly edit your videos using Youcut
YouCut - Video Editor & Maker - Apps on Google Play
Make your editing work easier than before
Picsart
Doesn't need much effort, give it a try
Filmora
Remove your backgrounds on a single click
Fotor
Turn your videos into slow motion using this
Slow Motion Video Editor - Slow Down Videos Online
Turn your videos into audios if need be
Audio Extractor: Video to MP3 - Apps on Google Play