Skill points are important as you will need them for the character progression, and also you will need them to learn your wanted skills. So how to get more skill points when you find yourself lack of skill points. Here are the ways to gain, including the doing the quest, place to get, etc.
Collect the skyshards
3 skyshards = 1 skill point. Collect skyshards as many as possible. And the DLC have them. Plus don't forget the Cyrodiil ones behind the enemy gates. It is difficult but not impossible to get. Main quests for DLC also have skill points.
Place to get skill points
Auridon, Grahtwood, Greenshade, Malabal Tor, Reaper's March, Stonefalls, Deshaan, Shadowfen, Eastmarch, The Rift, Glenumbra, Stormhaven, Rivenspire, Alik'r Desert, Bangkorai, and Coldharbour all have the following:
16 Skyshards (9 in the open world, 6 in delves, 1 in a public dungeon)
1 Group Event (these are in public dungeons and award a skill point)
1 Group Dungeon (this is where Undaunted Pledges take place, have 2 difficulties with their own quest, and each dungeon has those quests and they award a skill point each)
Do the Quests in each zone
Each zone (except the starter islands) have 4 major quests that reward a skill point. These are the quests that will finish Cadwell's Silver and Gold, and push you towards Coldharbour in your first alliance. That is 4 points x 5 zones x 3 alliances + 4 in Coldharbour = 64 skill points. Add optional 2 skill points from the Mages's Guild questline for 66. You have to remember that you don't have to complete every Zone in the game to get the Skyshards out in the open in each Zone, or in the Delves.
Run dungeons and solo play
Check your Achievements for public dungeons right back to the low level first zones, you get 1 skill point for completing each one and also another for completing the 'group' events in each one too so thats 2 skill points per dungeon.
At level 50 these can all be solo run quite easily. Also there are Skyshards in all the group delves in Cragorn, you can get all these solo and without having to kill any of the group bosses, it just takes time to work your way around the instances.
Hope above ways can be a little helpful for you.