Check out different armors and weapons. Each type of Elder Scrolls Online armor and weapon has its skill line. As players use a certain weapon type or armor, they gain XP with that skill line and are able to unlock more active and passive abilities by investing points into it. 

Manage your bag space. There is no such thing in MMORPGs as too many bags or too much bag space. Sooner or later, all players run out of storage space. This is why it's important to always clear bags of unwanted items, sell those that are valuable, use the bank for storage and once in a while upgrade the bags to hold more items. The best advice is to just prioritize item collecting. If you are not working towards certain professions, don't pick up any item associated with it. Make sure to not pick up junk as it fills valuable space for nothing. 

Craft your own gear. Elder Scrolls Online gear is not that easy to find. Surely, there are rewards from quests but not all pieces of equipment can be used by a certain character or class. Relying on drops is not such a good idea either. New players are advised to craft their own gear. Decide what type of armor and weapons you will be using and work on professions that allow you to obtain the needed items. Crafting own gear at low levels is a valid way to make a character stronger. If you don't have time to do this, cheap ESO Power Leveling service is a good choice.  

Don't forget about buffs. Foods and drinks give temporary stats boosts and improve regeneration. There are also abilities that increase stats. Buffs can also be obtained by activating stones found on the map. XP boosting items can be acquired from the premium store. 

Get familiar with all the traveling methods. Tamriel is a huge place. Make use of traveling ways as often as possible to save time. Don't forget to train your mount to increase its speed. Use wayshrines to shorten the distance between locations. Boats can be used as well.