Eldin Tower marks the beginning of one of the hottest areas of Hyrule. Scaling it requires getting to the top of an enormous hill fraught with dangers such as Fire Keese and Fire Chuchu. You will want to be especially careful of the latter; if you kill them, they explode! You can use these explosions to kill multiple enemies at once but don't get caught in it.
Once you have reached the actual Tower, you will notice that there is a profound lack of platforms in the Tower's lower half. To overcome this conundrum, you can climb up the surrounding rocks and Paraglide for a head start. Or, you can use Revali's Gale. As a last resort, pack some stamina food.