FFmpeg MOV to MP4, do I also need .OGG , .WEBM files too?

Question

I am new to FFmpeg and I'm just getting started. I have the two following commands to take a .mov upload and downsize it and save it out as an .mp4. I also produce a thumbnail version of the same.

What I am doing here seems to work well and I manage to get the .mov file from 12.5mb to about a 1mb .mp4.

My question from here is, can I get away with only providing a .mp4 for the source video, or do I need to provide additional .ogg and/or .webm files too? An if so, how is that best achieved? Would I have to loop that FFmpeg command again to output new .ogg and .webm files?

exec("ffmpeg -i src.mov -ss 00 -to 60 -vf scale=700:-1 -crf 30 -an -movflags +faststart output.mp4");

exec("ffmpeg -i src.mov -ss 00 -to 10 -vf 'scale=128:128:force_original_aspect_ratio=increase, crop=128:128' -crf 30 -an tn_output.mp4");