Non-tester here.
I cook often but also bulk cook and/or freeze leftovers , or make extra on purpose so there will be extra to freeze.
I save the plastic takeaway cartons when we get them, wash & reuse, good for curry (as you can't get the curry smell out no matter how well you clean them).
For stew, bolognaise etc, freeze in single portions. Work out roughly how much is a portion, put in a freezer bag, then freeze in the bag, inside a freezer safe plastic box. When fully frozen, gently remove from the box & ta da! A square block of stew that fits easily into the freezer. It takes a little more planning but really saves on freezer space in the long term.
Label EVERYTHING with a sharpie or similar, include the contents, date made and/or use by. Label the bags before you fill them - trying to write on a squishy, frozen bag, or a bag of frozen cubes of baby food, is over-rated.
Never stand at your freezer with the door open, deciding what to have for dinner. The longer it's open, the warmer it will get & have to cool down again. Plus, it will take moisture from the air which will freeze all around the door frame, so you have to defrost it sooner or risk losing loads of freezer space.
Wrap raw meat, fish, bread, etc in greaseproof paper, then in a freezer bag. Seal with a twist tie or freezer clip. The paper will protect against freezer burn. Slice bread before you freeze it & don't squash it in - if you want to just get one or two slices out, it's a lot easier if they aren't compressed together. Exclude all the extra air from bags, containers etc wherever possible. This will help for 3 reasons: firstly, it will reduce freezer burn. Secondly, it will reduce the chance of the container bursting if the contents expand as they freeze. Thirdly, it will take up less space in your freezer.
We have a drawer for meat, one for fish, one for veg & vegetarian food, one for bread & ready meals, & one for sweet things, frozen fruit, & anything for DD who is a toddler so I still make batches of things just for her, eg unsweetened rice pudding, or super mild curry.
When DD was weaning, she had her own drawer as I made all her food. Divide into baby food trays, then as soon as it's frozen, push it out into labelled bags. Make sure you have a decent supply of baby food trays as one pan of food can make more than 20 of those little portions.