Mon Ttemps Llibre

No need to capitalize every word of a title in French

Bonjour, ¶
J j'adore faire de la pluonger en mesée pendant mon temps libre.

"to dive" is "plonger" as a general action, but practicing the definite activity of diving in a sport context is "faire de la plongée"
"temps" would be singular here => MON

Je pluonge hors des 3m et 1à 1 ou 3 m.

"hors" means "outside of"
If you meant you usually reach 1 to 3 m depth while diving off, here's how it would be said

Parfrois, Jje aussi pluonge horsaussi [le long de la tour ?] qu'i a 3 niveaux différentes hauteurs, y compris, le 5s, à savoir 5 m, le 7.5,5 m et le 10 m.

When you're talking about three different things and explain what these three things are, the words would be "à savoir" or "c'est-à-dire" (explaining what the previously mentioned things are). "Y compris" means that one element one wouldn't have thought of is included in a general group, for instance "tout le monde est venu à mon anniversaire, Y COMPRIS cet inconnu" => everyone attended my birthday party, INCLUDING this unknown guy" (the unknown guy was among others)
"qui" can't be contracted, unlike "que" => qui
English dots are French commas in the French numeral system => 7,5 m

J'ai peur dues 10m á cause de il m parce que c'est très hautprofond, mais mon coach me'y fait plonger hors de lui.

peu = few ; peur = fear
à cause de + noun (because OF), parce que + clause (because)
"haut" would sound highly weird here since you're not reaching something up, you're reaching something down. Something which is "long downwards" is "profond" ("deep")
y = jusqu'aux 10 mètres

Je aussi 'adore bienaussi passer du temps avec mes amis.

je+vowel => j'
Either "j'adore" ("I really love, I'm really fond of") or "j'aime bien" ("I like") but you can't mix up both (since they mean slightly different things)