Ask the great gods if you have any questions about primary photography learning. .

Although there are many rewards, your question is too complicated. Answer a general question:

18*** refers to the wide-angle end, which is generally used in grand scenes. This lens has a good wide angle; *** 135 refers to the telephoto end, which is used to zoom in on distant objects. Generally 18- 135 belongs to the primary level. (Not recommended)

18- 105 should be a red circle lens, and the materials are excellent. The scenery of the characters is unknown, but its focal length is here. In addition, it is said that 18- 105 is like a big bellows, which will suck in a lot of dust with focusing, so consider it carefully!

It's best to buy a 55 or 50 fixed-focus lens for portrait shooting and close-up practice, and then buy a 70-200 shot of scenery and people. When you have used it almost, you can consider buying a macro of 100mm (New Budweiser). (In fact, whether to buy a red circle depends entirely on two conditions: 1 and money. 2. Is the photo too harsh?)

Regarding the aperture, the larger the aperture, the more you can shoot in a dark place. F/2.8 is already very big, no matter how big it is, it doesn't make much sense. After all, it doesn't need to take pictures at night, not to mention the Canon night shooting itself is not bad. Improving ISO is relatively clear.

That's all. Ask me if you have anything.