Hi Absuelto76
Welcome to the forum
There are MANY better people than me at editing, so hopefully others will chip in on here
Your GoPro will do 4k
Your TV should do 4k (If it's a recent model)
YouTube does hires stuff (when it's ready)
LF will handle and output 6 tracks of 4k video
But
Don't just set everything to the highest possible settings, bitrates etc
Check your TV does actually handle 4k and doesn't transcode it
Youtube will compress your video and it sometimes takes a while to have the highest resolution available
LF will give starred '*' suggestions for your output but maybe try setting the video quality slightly lower that will obviously drop the quality slightly but may make your output slightly smoother too
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