In FromSoftware's Elden Ring, health is a big deal. It's important to keep your HP bar in good condition while you're exploring The Lands Between, as it ensures that players don't lose their Runes when they die.
One way to get more health in Elden Ring is by increasing your 'Vigor' stat, which can be done as you level up. This will make your tough boss battles a little bit easier and will ensure that you don't have to worry about dying.
Alternatively, you can also try to increase your Sacred Flask charges, which will give you an even greater health boost. These can be replenished by resting at one of the game's Sites of Grace, which can be found around the map.
There are also some Keepsakes that can help to heal your character, such as the Crimson Amber Medallion. This item raises your maximum HP and can be purchased from the Castle Morne Rampart Merchant in Leyndell, The Royal Capitol.
Another way to heal your character is by using Raisins, which are found throughout the world of Elden Ring. These can be used to restore a character's health and are especially helpful for Torrent, the horse that you ride in the game.
Aside from Raisins, you can also use a special Talisman called the Blessed Dew to provide your character with a passive health boost that will regenerate itself at all times during your explorations. This Talisman can be obtained in Leyndell, The Royal Capitol, and is very easy to obtain early on in the game.